Methodology

Sources

Traficom (Liikenne- ja viestintävirasto, the Finnish Transport and Communications Agency) publishes registration statistics as PxWeb tables on its first-registration statistics page. Four tables are used:

• Henkilöautojen mallisarjojen ensirekisteröinnit alueittain kuukausittain — first registrations of passenger cars by model series, region, fuel and month; the source of every new-car model and make row.
• Käytettynä yksittäismaahantuodut henkilöautot kuukausittain, merkeittäin ja käyttövoimittain — individually imported used passenger cars by make, fuel and month.
• Käytettynä yksittäismaahantuodut henkilöautot kuukausittain, tuontimaittain — the same imports by the country they were imported from.
• Ensirekisteröityjen henkilöautojen keskimääräiset CO2-päästöt (WLTP) kuukausittain — Traficom's own average WLTP CO₂ of newly registered passenger cars.

Tables extracted: 2026-09-06. Latest complete month: 2026-08. The site shows the latest 36 months. Traficom publishes a month only once it is complete, so nothing on these pages is provisional and there is no register snapshot behind any figure: every number here is Traficom's own.

What is counted

• New (ensirekisteröinti): passenger cars registered for the first time anywhere in mainland Finland. Åland keeps its own register and is published separately, so it is not included.
• Used import (käytettynä maahantuotu): a car first registered abroad and then imported and registered individually in Finland.
• The monthly totals are Traficom's own totals: they include motorhomes and makes without a model breakdown, which have no make or model rows of their own. The model tables therefore add up to slightly less than the new-car total, and brand and model shares are shares of Traficom's own totals, so they add up to a little under 100 %.
• Model series are Traficom's own groupings (the "-sarja" labels), and they exist for new cars only. Used imports are published by make, origin country and age, never by model.
• Brand totals equal Traficom's make totals: they include the per-make "other models" subtotals that appear in no model row, so a brand's total can exceed the sum of its listed models.

Fuel groups

Petrol, diesel, plug-in hybrid, battery electric, gas (LPG / CNG) and other, mapped from Traficom's fuel codes on both the new-car and the used-import tables. Traficom records full hybrids without a plug under petrol or diesel, so they cannot be shown separately.

Age at import

Age at import = registration year minus the year of first use as published by Traficom (years before 1986 are grouped in bands and count as the band's last year). Origin is the country the car was imported from. Brackets: under 3, 3–5, 6–10 and over 10 years.

Origin

The origin is the country the car was imported from, not necessarily where it was built. Traficom publishes individual countries alongside its own aggregates — "other EU country", "other EEA country" and "other countries" — and those are shown exactly as published, without redistributing them over countries.

CO₂

The average CO₂ tile and chart are Traficom's own published WLTP average for the month's newly registered passenger cars. Nothing is recomputed here, and used imports have no published CO₂.

KPI definitions

Registrations

New cars first registered in Finland plus used cars imported and registered in the month, from Traficom's statistics. Motorhomes are included in the totals but have no make or model rows.

New cars / New share

Ensirekisteröinti: new passenger cars registered for the first time, mainland Finland. New share = new cars ÷ all registrations.

Used imports / Avg import age (yrs)

Käytettynä maahantuotu: used cars imported individually and registered in Finland. Average import age = registration year minus the year the car was first taken into use.

BEV share

Battery-electric share of new cars plus used imports. PHEV = plug-in hybrids; Traficom records full hybrids under petrol or diesel.

New-car BEV share

Battery-electric cars as a share of new registrations only.

Avg CO₂, new (g/km)

Traficom's own published average WLTP CO₂ of the month's newly registered passenger cars; nothing is recomputed here and used imports have no published CO₂.

MoM / YoY / YTD

Change versus the previous month, versus the same month a year earlier, and the calendar-year-to-date total (with its change versus the same period a year earlier).

Checks

At ingest, every derived table must reproduce Traficom's own totals exactly: the summed model rows must equal the published new-car total row, and the summed used-import rows must equal the published used total, per month. An acceptance gate reviews the top 40 makes and models for coverage, sibling makes that should be one brand, and single-letter or otherwise suspect model names. A sanity gate rejects an export whose latest month is less than half the previous month, whose month series has a gap, or where any mart is empty for the latest month. An identity gate compares the exported new, used and total counts against the raw Traficom totals. A fuel gate fails when more than 2 % of a month's registrations carry a fuel code that is not mapped to a group. Finally, a consistency audit re-derives shares, MoM, YoY and rankings from the exported JSON and fails on any mismatch.

Caveats

• Counts are Traficom's official first registrations and used-import registrations of passenger cars in mainland Finland; they are complete and not affected by later exports. Model series are Traficom's own; used imports are published by make only.
• Percentages are shown only when the comparison month has at least 30 registrations.
• Make and model names are normalised: Traficom's "-sarja" suffix is folded away ("3-sarja" becomes the BMW 3 Series, "GLC-sarja" becomes GLC), body variants fold into the base model, and brand spellings are unified; series Traficom keeps apart (Tourneo Custom / Connect / Courier, Discovery Sport) stay apart. Traficom's unspecified "VOLKSWAGEN ID." series is shown as "ID. (OTHER)". The full alias table is in the repository.
• Brands with fewer than 50 registrations over the 36 months have no brand page and appear as plain text in the tables.
• Registration is not sale: dealer demo stock and leasing fleets register too.

Data files

Every page is generated from JSON under /data/fi/: meta.json, months.json, YYYY-MM.json (with kpis, models[], makes[], import_origin[], import_age[], import_make[], bev_models[], bev_makes[]), makes.json, makes/<slug>.json. Free to reuse with attribution to Traficom and auto-stats.eu (CC BY 4.0).