Year	% of total
1990	0.5198833220620708
1991	0.5012237817433082
1992	0.6033601083739005
1993	0.5611404930766634
1994	0.5657055218291349
1995	0.5828825307483844
1996	0.6486283538796228
1997	0.667723445402848
1998	0.6578055417621449
1999	0.665636534961311
2000	0.6770108584273171
2001	0.46971110125318843
2002	0.7548987253716077
2003	0.6742522091672256
2004	0.5171939683092309
2005	0.4363691389542233
2006	0.1980055222144276
2007	0.2382726076408096
2008	0.33785380739414156
2009	0.2910402200447717
2010	0.3039212725390342
2011	0.5268074290537709
2012	0.4607252185772176
2013	0.5736135533790412
2014	0.675180228587304
2015	0.6528455624563368
2016	0.518660448963848