Year	Percent
1990	5.19
1991	5.28
1992	5.79
1993	6.32
1994	6.68
1995	6.52
1996	6.32
1997	6.04
1998	5.81
1999	6.39
2000	7.91
2001	6.17
2002	5.14
2003	6.34
2004	4.33
2005	3.9
2006	4.51
2007	5.35
2008	5.67
2009	5.17
2010	4.37
2011	5.15
2012	5.78
2013	5.29
2014	5.77
2015	6.32
2016	8.05
2017	8.98
2018	9.34
2019	9.83