Year	Percent
1992	4.12796
1993	4.71497
1994	4.44073
1995	3.78286
1996	3.47438
1997	2.74744
1998	2.06306
1999	1.86
2000	1.62085
2001	1.37365
2002	1.34316
2003	1.21752
2004	1.15738
2005	1.19122
2006	1.40891
2007	1.37858
2008	1.4942
2009	2.22876
2010	2.67241
2011	2.61921
2012	2.56846
2013	2.42925
2014	1.94577
2015	1.47318
2016	1.22672
2017	1.09822