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	22.03202650469354
1983	53.66490556871318
1984	69.38274360977788
1985	77.90951638065523
1986	84.85471363169205
1987	95.10233302450939
1988	98.23536331908552
1989	97.05785607251197
1990	98.20651047066141
1991	96.44417895431823
1992	95.79453977712207
1993	94.9847009735744
1994	97.99947649852298
1995	97.3420260782347
1996	81.87891146895436
1997	59.51286923475557
1998	65.00938982079767
1999	56.102108617533396
2000	60.44492674986435
2001	61.386901825357675
2002	63.737832954479224
2003	77.66481737024417
2004	68.9189917052677
2005	70.2972614496372
2006	68.83755858818655
2007	73.22602177038407
2008	68.10549034058009
2009	70.75028400289166
2010	61.974105817073486
2011	71.03661654904367
2012	70.30171969931006
2013	74.82251391797334
2014	76.17579994487458
2015	65.44044175650802