Year	% of total electricity output
1990	1.86443127619598
1991	1.80603005074795
1992	2.37397768257785
1993	2.60851774815017
1994	3.05023206425868
1995	3.97358646306232
1996	3.54261003086662
1997	3.41498357132846
1998	3.06851943550384
1999	3.67524431490516
2000	3.1325863038499
2001	3.47145512837783
2002	3.94499638134088
2003	2.26888523956723
2004	3.27127342164936
2005	3.8227288816199
2006	4.2078083534559
2007	3.88541998997311
2008	4.47926045981151
2009	5.70119560956488
2010	6.91813578394599
2011	8.35253987277588
2012	9.30358646625215
2013	10.8234117756488
2014	10.7784149666259
2015	11.4045705432362