Year	Percent
1990	4.66
1991	4.41
1992	2.45
1993	4.13
1994	2.5
1995	2.06
1996	2.15
1997	3.64
1998	4.31
1999	3.76
2000	5.46
2001	2.88
2002	4.53
2003	4.12
2004	6.88
2005	3.8
2006	5.59
2007	6.23
2008	4.29
2009	4.38
2010	3.81
2011	3.92
2012	4.32
2013	3.73
2014	3.7
2015	3.33
2016	3.08
2017	2.88
2018	2.44
2019	2.24
2020	2.25