Year	Percent
1990	3.16526
1991	3.42477
1992	2.33379
1993	2.27119
1994	1.89417
1995	2.9175
1996	2.83621
1997	2.75672
1998	2.67898
1999	2.60284
2000	1.78283
2001	1.73077
2002	1.67924
2003	1.62815
2004	1.41254
2005	1.59487
2007	1.49208
2008	1.44095
2009	1.33101
2010	1.28353
2011	1.23794
2012	1.1937
2013	1.15136
2014	1.11252
2015	1.0783
2016	1.04607
2017	1.0636
2018	0.99247
2019	1.01181
2020	1.03775