Year	Percent
1992	2.324
1993	2.61813
1994	3.1833
1995	3.19818
1996	3.27209
1997	3.03828
1998	3.11803
1999	2.69804
2000	2.18952
2001	1.5497
2002	1.85981
2003	1.88382
2004	2.03674
2005	2.47586
2006	2.32572
2007	2.14168
2008	1.79884
2009	1.92225
2010	2.20178
2011	1.80899
2012	1.68658
2013	2.04615
2014	2.0255
2015	2.01794
2016	1.94628
2017	1.74923