Year	Percent
1990	3.37
1991	3.64
1992	2.47
1993	1.69
1994	1.68
1995	1.72
1996	1.51
1997	1.31
1998	1.31
1999	1.26
2000	0.99
2001	1.01
2002	0.96
2003	1.27
2004	1.31
2005	1.44
2006	1.14
2007	1.17
2008	1.63
2009	1.51
2010	1.6
2011	1.83
2012	1.76
2013	1.7
2014	2.02
2015	2.57
2016	2.67
2017	3.58
2018	3.99
2019	4.56