diff --git a/data/gr-e-11.03.02.01.01-cc.csv b/data/gr-e-11.03.02.01.01-cc.csv
new file mode 100644
index 00000000..47567275
--- /dev/null
+++ b/data/gr-e-11.03.02.01.01-cc.csv
@@ -0,0 +1,45 @@
+year,passenger cars,passenger vehicles,goods vehicles,agricultural vehicles,industrial vehicles,motorcycles,mopeds (incl. fast e-bikes)¹
+1980,2246752,11087,169402,137685,0,137340,671473
+1981,2394455,11122,167846,151238,0,152508,687517
+1982,2473318,11341,178313,156631,0,178398,656102
+1983,2520610,11255,189920,165332,0,187090,674710
+1984,2552132,10853,192708,164078,0,199302,647391
+1985,2617164,10771,200537,175161,0,217974,644175
+1986,2678911,10800,207014,183689,0,225676,627523
+1987,2732720,11027,217750,189984,0,240102,613093
+1988,2819548,26869,236649,152693,43519,219987,581270
+1989,2895842,29270,241488,157867,44326,261715,551808
+1990,2985397,31180,252136,162932,45920,299264,464609
+1991,3057798,32968,257646,165571,46938,319779,418251
+1992,3091228,34136,256611,169277,47281,336448,381236
+1993,3109523,34852,253461,171414,47229,348159,358732
+1994,3165042,35676,256285,172300,47373,357252,336367
+1995,3229176,36517,262352,174026,47693,370700,317783
+1996,3268093,37662,263020,174247,47622,381986,301009
+1997,3323455,38508,264200,175689,47743,410750,280467
+1998,3383307,39012,267380,176712,47754,435042,265422
+1999,3467311,39692,273954,177148,48265,464357,246018
+2000,3545247,40260,278518,177963,48949,493781,218932
+2001,3629713,41342,285246,179321,49549,521390,199033
+2002,3700951,42401,290142,180063,50227,545132,186811
+2003,3753890,43629,292329,180295,50795,567358,173486
+2004,3811351,44784,298193,180898,50957,583010,165000
+2005,3863807,45785,307264,182093,51860,592194,156095
+2006,3899917,46445,314020,185450,53437,608648,150563
+2007,3955787,48026,324153,184062,55149,619166,144704
+2008,3989811,48536,326232,188218,55808,636540,141549
+2009,4009602,50675,327808,185902,56533,642777,139220
+2010,4075825,52751,335200,186485,58492,651202,139548
+2011,4163003,55422,348553,187130,60324,665870,142834
+2012,4254725,58278,361926,188358,62219,679822,145984
+2013,4320885,60151,371361,189305,63950,687990,147247
+2014,4384490,62436,382281,190095,65563,699219,152962
+2015,4458069,65720,393598,191132,67101,710022,161292
+2016,4524029,69676,405566,192139,68721,720381,176030
+2017,4570823,73814,416501,192858,70113,729149,188053
+2018,4602688,77985,428808,193283,71683,739344,201423
+2019,4623952,83054,440795,193834,74085,744542,211480
+2020,4658335,88293,452186,195082,75659,771586,229421
+2021,4709366,97805,466857,196530,77672,791323,244572
+2022,4721280,105158,475714,196942,79691,789794,257753
+2023,4760948,114299,485303,197678,81241,805653,
\ No newline at end of file
diff --git a/rules/build_sector.smk b/rules/build_sector.smk
index 3a0fda21..e41d0224 100644
--- a/rules/build_sector.smk
+++ b/rules/build_sector.smk
@@ -289,6 +289,7 @@ rule build_energy_totals:
         nuts3_shapes=resources("nuts3_shapes.geojson"),
         co2="data/bundle-sector/eea/UNFCCC_v23.csv",
         swiss="data/switzerland-new_format-all_years.csv",
+        swiss_transport="data/gr-e-11.03.02.01.01-cc.csv",
         idees="data/bundle-sector/jrc-idees-2015",
         district_heat_share="data/district_heat_share.csv",
         eurostat="data/eurostat/eurostat-energy_balances-april_2023_edition",
diff --git a/scripts/build_energy_totals.py b/scripts/build_energy_totals.py
index 1b36ec1b..29cf8182 100644
--- a/scripts/build_energy_totals.py
+++ b/scripts/build_energy_totals.py
@@ -712,15 +712,25 @@ def build_co2_totals(countries, eea_co2, eurostat_co2):
 
 
 def build_transport_data(countries, population, idees):
-    transport_data = pd.DataFrame(index=countries)
+    # first collect number of cars
 
-    # collect number of cars
+    transport_data = pd.DataFrame(idees["passenger cars"])
 
-    transport_data["number cars"] = idees["passenger cars"]
-
-    # CH from http://ec.europa.eu/eurostat/statistics-explained/index.php/Passenger_cars_in_the_EU#Luxembourg_has_the_highest_number_of_passenger_cars_per_inhabitant
+# https://www.bfs.admin.ch/bfs/en/home/statistics/mobility-transport/transport-infrastructure-vehicles/vehicles/road-vehicles-stock-level-motorisation.html
     if "CH" in countries:
-        transport_data.at["CH", "number cars"] = 4.136e6
+        fn = snakemake.input.swiss_transport
+        swiss_cars = pd.read_csv(fn, index_col=0).loc[1990:2021, ["passenger cars"]]
+
+        swiss_cars.index = pd.MultiIndex.from_product(
+            [["CH"], swiss_cars.index],
+            names=["country", "year"]
+        )
+
+        transport_data = pd.concat([transport_data, swiss_cars]).sort_index()
+
+    transport_data.rename(
+        columns={"passenger cars": "number cars"}, inplace=True
+    )
 
     missing = transport_data.index[transport_data["number cars"].isna()]
     if not missing.empty: