Year	Percent
1990	2.53
1991	1.89
1992	2.1
1993	2.17
1994	2.64
1995	2.11
1996	2.84
1997	2.41
1998	2.19
1999	2.04
2000	1.85
2001	1.78
2002	1.57
2003	2.41
2004	2
2005	1.67
2006	1.59
2007	1.44
2008	1.19
2009	1.16
2010	1.51
2011	1.17
2012	0.96
2013	1.04
2014	1.28
2017	0.97