Year	Percent
1990	1.39
1991	1.7
1992	1.89
1993	1.96
1994	2.04
1995	2.21
1996	1.89
1998	1.73
2000	2.67
2001	4.07
2007	0.89
2008	0.51
2009	1.19
2010	0.72
2011	0.62
2012	0.48
2013	0.7
2014	0.69
2015	0.89
2016	0.9