Year	Percent
1990	5.18737
1991	5.04119
1992	5.39073
1993	5.34956
1994	5.1734
1995	4.79676
1996	5.04293
1997	5.09781
1998	5.66427
1999	5.01306
2000	3.73277
2001	4.10364
2002	3.56463
2003	3.30681
2004	4.21684
2005	1.16185
2006	1.16616
2007	1.1451
2008	1.23582
2009	1.36317
2010	1.17623
2011	1.11415
2013	1.06989