Year	Percent
1996	71.0244
1997	71.19656
1998	73.79863
1999	69.97188
2000	71.56183
2001	69.64845
2002	69.46804
2003	68.86576
2006	71.86391
2007	72.85974
2008	73.77516
2010	72.76658
2011	73.57603
2012	75.16613
2013	74.76821
2014	74.27909
2015	74.22998
2016	73.43407
2017	71.77754