Year	Biodiesel	Ethanol	Electric	Liquefied petroleum gas	Natural gas	Plug-in hybrids	All alternative fuel cars
2000	0	0	0	0	0.1	0	13.5
2001	0	0	0	1.8	0.1	0	14.8
2002	0	0	0	4.9	4.3	0	15.9
2003	0	0	0.1	2.3	13.1	0	15.5
2004	0	0	0.1	3.3	19.9	0	23.3
2005	0	0	0	11.6	25.5	0	37
2006	0	0	0	34.8	14.4	0	49.2
2007	0	0	0	89.9	21.7	0	111.6
2008	0	0	0	161.5	22.9	0	184.5
2009	0	1.2	0.2	498	12.9	0	512.2
2010	0.1	13.2	7	359.3	78.6	0	458.1
2011	0.1	28.4	8.7	85.5	52.3	0	174
2012	0	22.1	14	161.3	65.5	0	262.9
2013	0	4.5	24.2	130.5	81.6	31.2	271.9
2014	0	3.3	37.9	142.5	90.4	68.1	342.2
2015	0	1.7	56.8	138.1	78.3	103.6	378.4
2016	0.2	1.9	64.3	253	57.3	93.7	470.3