Year	% of total
1986	22
1993	47.2
1997	46.5
1999	48.3
2000	57.8
2002	58
2004	58
2005	51.9
2011	65.1
2013	50.5
2014	59.1
2015	53.2
2016	58.6
2017	68.4
2018	74.2
2019	74.5