Year	Percent
1995	49.46
1996	51.01
1997	51.49
1998	45.85
1999	47.49
2000	48.65
2001	54.94
2002	62.76
2003	64.27
2004	69.31
2005	69.56
2006	69.93
2007	70.24
2008	68.09
2009	63.88
2010	63.7