Year	Percent
1990	1.98564
1991	2.00983
1992	2.30012
1993	2.58633
1994	3.05896
1995	2.90635
1996	3.01658
1997	3.12804
1998	2.9979
1999	2.674
2000	2.42458
2001	1.98563
2002	1.85517
2003	1.92571
2004	2.21459
2005	2.1577
2006	2.16867
2007	1.88342
2008	1.65684
2009	2.08901
2010	2.27577
2011	2.26003
2012	2.39286
2013	2.5525
2014	2.85516
2015	2.90008
2016	2.80474
2017	2.60005