Year	Percent
1991	3.53174
1992	3.37708
1993	3.19877
1994	3.15543
1995	3.8723
1996	2.64482
1997	2.34128
1998	2.91933
1999	1.95244
2000	2.44413
2001	1.52893
2002	1.96904
2003	2.72328
2004	1.9604
2005	1.73534
2006	1.82842
2007	1.84506
2008	1.66489
2009	1.35543
2010	1.1029
2011	1.23235
2012	1.32509
2013	1.58601
2014	1.42641
2015	1.04467
2016	1.02571
2017	1.38897
2018	1.0539
2019	0.68499