Year	Percent
1995	45.60678
1996	46.18934
1997	47.59381
1998	47.54079
1999	44.14772
2000	50.0056
2001	51.74892
2002	52.15757
2003	50.89585
2004	54.96624
2005	59.57994
2006	64.69539
2007	67.59706
2008	66.10883
2009	57.24268
2010	64.28811
2011	70.37396
2012	73.12463
2013	74.51709
2014	75.81348
2015	76.99218
2016	77.65409
2017	82.21078