Year	% of total
1990	93.92556938301948
1991	93.78245010781083
1992	91.17220052017481
1993	89.58488973713739
1994	67.3949278846489
1995	67.98200761885384
1996	72.99470786691971
1997	84.74508396498364
1998	85.61244938845093
1999	84.80497788829024
2000	87.89389885026793
2001	87.29585731475676
2002	87.74904709111728
2003	88.87669927476848
2004	89.00098520364685
2005	88.50970946891226
2006	90.49292977701133
2007	91.07144944482422
2008	92.31931424407594
2009	92.60429081282257
2010	91.65263533223984
2011	93.99664294654913
2012	91.94780332275738
2013	92.50400216671697
2014	77.5220449672342