Year	Percent
1995	8.27
1996	7.61
1997	7.1
1998	6.23
1999	6.26
2000	5.45
2001	4.08
2002	3.31
2003	2.33
2004	1.85
2005	1.95
2006	1.91
2007	1.79
2008	1.58
2009	1.67
2010	2.5
2011	3.18
2012	3.46
2013	3.29
2014	2.7
2015	2.4
2016	2
2017	1.7
2018	1.7