Year	% of total
1960	0
1961	0
1962	0
1963	0
1964	0
1965	0
1966	0
1967	0
1968	0
1969	0
1970	0
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	0.08039393025826551
1987	2.2516606711205007
1988	2.5293660889821408
1989	2.3011381304807514
1990	2.504005616850552
1991	2.634769741643556
1992	3.138261706221937
1993	3.6284921776934147
1994	4.451517708008946
1995	4.960769430928157
1996	6.113759293680297
1997	7.092418230812117
1998	7.823976262750568
1999	8.688706539631866
2000	8.549278676293094
2001	9.12307702116807
2002	10.515813525566092
2003	10.848435246766105
2004	11.944029284388535
2005	13.059982919513416
2006	13.502548568612148
2007	14.231469790628115
2008	14.199540910773786
2009	13.824448314585355
2010	15.409113816041515
2011	15.947081819551642
2012	17.19931731668225
2013	18.248485208486713
2014	16.859439249146757
2015	14.85820926283161
2016	15.390806630013987