Year	Percent
1990	0.2
1991	0.17
1992	0.2
1993	0.2
1994	0.25
1996	0.27
1997	0.38
1998	0.47
1999	0.51
2000	0.42
2001	1.12
2002	1.19
2003	1.63
2004	1.52
2005	0.93
2006	0.98
2007	1.15
2008	0.81
2009	0.95
2010	1.21
2011	0.89
2012	0.78
2013	0.71
2014	0.67
2015	0.66
2016	0.68
2017	0.71
2018	0.8
2019	0.53
2020	0.98