Year	Percent
1983	1.34
1984	0.65
1986	1.07
1987	1.35
1988	1.45
1989	2.05
1991	1.56
1992	1.31
1995	2.16
1996	1.54
1998	1.19
2007	1.41
2008	2.6
2009	3.18
2010	2.4
2011	1.16
2012	1.29
2013	3.6
2014	4.87
2015	2.69
2016	2.49
2017	3.09
2018	2.16
2019	2.61
2020	2.62