Year	Percent
1990	5.31681
1991	7.46995
1992	10.12836
1993	11.83426
1994	12.13167
1995	9.04232
1996	7.66127
1997	9.91122
1998	7.19966
1999	6.29423
2000	10.16043
2001	8.89158
2002	8.49451
2003	8.23542
2004	8.15933
2005	8.08475
2006	8.43357
2007	7.87561
2008	8.21252
2009	8.412
2010	9.08079
2011	9.3083
2012	9.51365
2013	9.11927
2014	8.59522