Year	Percent
1989	36.44466
1990	39.89389
1991	40.54177
1992	44.79652
1993	47.50311
1994	50.65898
1995	54.14704
1996	55.71437
1997	57.01659
1998	59.06706
1999	60.89938
2000	62.79495
2001	60.9493
2002	60.62664
2003	90.0182
2004	56.87615
2005	93.71444
2006	98.72905
2007	45.53125
2008	49.82749
2009	48.68015
2010	49.90866
2011	45.15697
2012	45.28922
2013	46.99437
2014	47.1824
2015	49.27543
2016	48.85089