Year	% of total
1986	49
1992	80
1996	55.1
2000	59.3
2004	71.1
2006	71
2008	79.4
2009	82.5
2010	83.8
2011	85
2012	86.7
2013	89.1
2014	90
2015	91.6
2016	92.4
2017	93.6
2018	93.7
2019	94.4
2020	95.7
2021	94.9