Year	Percent
1990	9.41
1991	9.74
1992	11.84
1993	12.64
1994	12.36
1995	12.34
1996	12.09
1997	14.55
1998	8.7
1999	9.14
2000	6.72
2001	6.8
2002	7.82
2003	6.73
2004	9.55
2005	8.67
2006	10.85
2007	11.4
2008	12.29
2009	8.63
2010	6.08
2011	5.73
2012	6.58
2013	7.58
2014	6.99
2015	7.62
2016	8.25
2017	8.92
2018	9.7
2019	10.59