Year	Percent
1985	4.41
1987	6.5
1988	5.88
1989	5.54
1990	5.74
1991	6.11
1992	5.92
1993	6.29
1994	5.74
1995	5.92
1996	5.19
1997	5.56
1998	6.63
1999	6.25
2001	2.36
2003	2.32
2004	2.26
2005	2.61
2006	2.73
2007	2.27
2008	2.4
2009	2.53
2010	2.33
2011	2.34
2012	2.25
2013	2.35
2014	2.41
2015	2.02
2016	1.81
2017	1.73
2018	1.69
2019	1.6
2020	1.98