Year	Percent
1979	1.62
1980	1.35
1981	1.5
1982	1.14
1983	1.52
1984	1.46
1985	1.6
1986	1.34
1987	1.09
1988	1.27
1989	1.54
1990	1.6
1991	1.77
1992	2.09
1993	1.98
1994	1.81
1995	1.47
1996	1.67
1997	1.6
1998	1.15
1999	0.92
2000	1.02
2001	1.44
2002	0.93
2003	0.88
2004	0.91
2005	1.01
2006	1.33
2007	1.17
2008	1.01
2009	1.27
2010	1.53
2011	1.15
2012	1.62
2013	1.51
2014	2.22
2015	1.51
2016	1.55
2017	1.4
2018	1.6
2019	1.86
2020	2.52