Year	Percent
1990	4.51
1991	5.37
1992	3.93
1993	3.95
1994	4.05
1995	5.18
1996	6.16
1997	5.68
1998	5.33
1999	5.9
2000	5.08
2001	5.92
2002	6.33
2003	6.56
2004	6.39
2005	6.57
2006	5.74
2007	4.49
2008	4.78
2009	7.71
2010	7.17
2011	10.14
2012	9.78
2013	8.77
2014	9.06
2015	9
2016	8.6
2017	8.14
2018	9.63
2019	11.49
2020	17.41