Year	Percent
1982	3.4
1983	3.8
1984	5.84
1985	6.92
1986	8.29
1987	7.33
1988	7.26
1989	5.73
1990	4.5
1992	3.71
1993	4.11
1995	3.15
1996	2.52
1997	2.45
1998	3.2
1999	3.43
2000	3
2001	3.53
2002	3.48
2003	3.61
2004	3.54
2005	3.53
2006	3.31
2007	3.23
2008	3.32
2009	3.66
2010	3.39
2011	3.05
2012	3.1
2013	3.16
2014	2.88
2015	3.1
2016	3.44
2017	3.41
2018	3.3
2019	3.26
2020	4.54