Year	Percent
1992	8.67531
1993	8.10751
1994	7.522
1995	5.8342
1996	4.18671
1997	3.83901
1998	2.59422
1999	1.05774
2000	0.79154
2001	0.71712
2002	0.62534
2003	0.5732
2004	0.45769
2005	0.44045
2006	0.37867
2007	0.35214
2008	0.3078
2009	0.2502
2010	0.22438
2011	0.23584
2012	0.21631
2013	0.21077