Year	%
1985	76.56579
1986	76.36163
1987	77.74956
1988	74.58691
1989	75.44092
1990	76.46917
1991	77.61996
1992	78.86578
1993	80.20862
1994	81.41593
1995	82.45047
1996	83.61537
1997	84.81287
1998	86.03632
1999	87.11207
2000	87.07454
2001	89.05893
2002	90.67937
2003	88.0376
2004	87.49954
2005	89.19637
2006	90.65608
2007	90.67895
2008	91.02425
2009	91.55576
2010	91.99801
2011	92.14565
2012	90.59078
2013	90.81557
2016	90.83289
2017	91.91673