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	0.0008337489935478039
1987	0.0011450869040551333
1988	0.0020678953973333716
1989	0.0018737424599593335
1990	0.009261476757202472
1991	0.010356792119173472
1992	0.021824145303353786
1993	0.02303510721314855
1994	0.04309868472442796
1995	0.10551582519843206
1996	0.17617803403453106
1997	0.18605970838976826
1998	0.18982303707334128
1999	0.37882688956113014
2000	0.44487573548042975
2001	0.576028769916929
2002	0.7200340799270988
2003	0.8943561902166522
2004	1.053340852341871
2005	1.290465073382717
2006	1.6661456970244102
2007	1.9826073557243635
2008	2.3363663724597377
2009	2.8468791767601638
2010	2.998097440777674
2011	3.4358633186029377
2012	4.039171945355718
2013	4.349665885329075
2014	4.58727186835488
2015	4.767945940872503