Year	% of total
1971	0
1972	0
1973	0
1974	0
1975	0
1976	0
1977	0
1978	0
1979	0
1980	0
1981	0
1982	0
1983	0
1984	0
1985	0
1986	0
1987	0
1988	0
1989	0
1990	0
1991	0
1992	0
1993	0
1994	0
1995	4.479131319986427
1996	36.34131368937999
1997	43.86008434631605
1998	54.027846842366976
1999	58.62570064355408
2000	62.979166666666664
2001	62.8863868986694
2002	67.09482432942954
2003	63.868684883035186
2004	66.18874773139746
2005	72.64566097518042
2006	71.03448275862068
2007	65.72544841058426
2008	65.08620689655173
2009	62.27218531766309
2010	70.29337803855825
2011	69.32283980980488
2012	67.46009122006842
2013	75.45098039215686
2014	69.93724354332609
2015	78.05074044311789