Year	% of total final energy consumption
1990	1.2
1991	1.1
1992	1.2
1993	1.2
1994	1.2
1995	1.2
1996	1.3
1997	1.5
1998	1.6
1999	1.6
2000	1.7
2001	1.8
2002	1.9
2003	1.9
2004	2.2
2005	2.7
2006	3.1
2007	3.7
2008	3.9
2009	4.4
2010	3.9
2011	4.7
2012	4.9
2013	5
2014	5.6
2015	5.8
2016	5.6
2017	6.4
2018	7.4
2019	8.6
2020	10.7
2021	12.2