Year	Percent
1990	4.792
1991	4.984
1992	5.083
1993	5.165
1994	4.703
1995	6.3283
1996	5.3396
1997	5.0243
1998	4.0224
1999	3.2341
2000	3.2759
2001	3.6126
2002	4.0943
2003	3.9565
2004	3.9228
2005	4.192
2006	3.3437
2007	2.4229
2008	2.3635
2009	2.6033
2010	2.9425
2011	2.9908
2012	2.6329
2013	3.2311
2014	3.235
2015	3.9985
2016	3.9123
2017	3.691