Year	Percent
1992	84.40643
1993	71.63175
1994	66.23716
1995	67.42304
1996	71.72404
1997	77.22301
1998	79.7951
1999	70.78652
2000	84.46438
2001	89.09528
2002	88.27262
2003	94.92433
2004	100.63902
2005	106.12637
2006	123.01852
2007	138.03726
2008	144.58434
2009	125.61762
2010	144.90296
2011	162.63056
2012	169.15008
2013	170.07221
2014	166.83146
2015	169.9247
2016	170.51434
2017	175.22995