Year	%
1990	77.73811
1991	79.48579
1992	81.92416
1993	81.9023
1994	83.66685
1995	86.68851
1996	87.4668
1997	87.54113
1998	87.61705
1999	88.71383
2000	89.24344
2001	90.72449
2002	92.00159
2003	90.72648
2004	90.68141
2005	92.04235
2006	93.47136
2007	94.02838
2008	94.27564
2009	94.54193
2010	95.06114
2011	94.63089
2012	93.76355
2013	93.15845
2014	93.571
2015	94.1112
2016	93.93048
2017	94.69612