Year	Percent
1992	1.64232
1993	1.53179
1994	2.58636
1995	3.45862
1996	2.98827
1997	3.11227
1998	2.66756
1999	2.59942
2000	2.8789
2001	2.34638
2002	2.72626
2003	2.86629
2004	2.84851
2005	3.07773
2006	3.16872
2007	3.05783
2008	2.90491
2009	3.17608
2010	3.84582
2011	3.39873
2012	3.20738
2013	3.19622
2014	3.37589
2015	3.5075
2016	3.51874
2017	3.15817