Year	Percent
1990	5.211
1991	5.814
1992	5.985
1993	5.88
1994	6.231
1995	5.157
1996	4.762
1997	4.525
1998	4.97
1999	5.934
2000	5.01
2001	7.091
2002	9.038
2003	8.898
2004	9.212
2005	9.012
2006	7.4667
2007	7.4849
2008	8.316
2009	11.0839
2010	9.1509
2011	7.2583
2012	6.7295
2013	6.8575
2014	7.8131
2015	7.9998
2016	8.4239
2017	8.0676