Year	Percent
1975	71.12252
1976	73.06895
1977	78.27595
1993	88.29509
1994	89.94194
1995	92.796
1996	94.81855
1997	95.0963
1999	94.66295
2000	94.79142
2001	95.02017
2002	96.04445
2003	95.91842
2004	97.1742
2005	97.55244
2006	97.7134
2007	97.80653
2008	96.41763
2009	94.36512
2010	93.91002
2011	94.0281
2012	99.59669
2013	103.49399
2014	105.39619
2015	100.86571
2016	100.56274