Year	Percent
1990	4.57
1991	4.74
1992	4.92
1993	5.16
1994	5.2
1995	5.23
1996	5.2
1997	4.86
1998	4.55
1999	4.26
2000	4.68
2001	5.17
2002	5.72
2003	5.24
2004	4.5
2005	3.86
2006	3.33
2007	3.39
2008	3.33
2009	3.27
2010	3.45
2011	2.77
2012	3.17
2013	2.52
2014	2.01
2015	3.3
2016	3.54
2017	2.62
2018	3.87
2019	3.18