Year	Percent
1992	1.49803
1993	2.11659
1994	1.91235
1995	1.96498
1996	2.09781
1997	1.72975
1998	1.83185
1999	1.48204
2000	1.34169
2001	1.12366
2002	1.16323
2003	1.26934
2004	1.35771
2005	1.79599
2006	1.97354
2007	1.93324
2008	1.97127
2009	2.35127
2010	2.86818
2011	2.79522
2012	2.76999
2013	2.6731
2014	2.07195
2015	1.83153
2016	1.3287
2017	1.09163