Year	Percent
1996	2.28206
1997	2.21591
1998	2.56571
1999	2.40238
2000	2.6006
2001	2.1323
2002	2.12624
2003	2.27847
2004	2.09617
2005	2.1669
2006	2.055
2007	1.52209
2008	1.2908
2009	1.5152
2010	2.33571
2011	2.55156
2012	2.86554
2013	3.44848
2014	3.38907
2015	3.01066
2016	2.70442
2017	2.0511