Year	Percent
1990	3.02
1991	3.3
1992	2.81
1993	2.55
1994	2.82
1995	3.04
1996	4.6
1997	3.79
1998	3.48
1999	3.81
2000	3.25
2001	3.73
2002	4.13
2003	4.14
2004	4.18
2005	4.33
2006	3.53
2007	2.79
2008	3.27
2009	5.54
2010	4.93
2011	7.89
2012	7.31
2013	6.35
2014	6.2
2015	6.76
2016	6.46
2017	6.31
2018	7.48
2019	8.77
2020	14.83