Year	Percent
1991	7.734
1992	7.553
1993	5.81
1994	5.496
1995	4.656
1996	4.279
1997	4.261
1998	4.02
1999	3.653
2000	3.337
2001	3.424
2002	3.691
2003	2.66
2004	2.668
2005	2.641
2006	2.621
2007	2.278
2008	2.313
2009	2.586
2010	2.306
2011	2.642
2012	2.8
2013	2.607
2014	2.635
2015	2.645
2016	2.841
2017	2.796
2018	2.617
2019	2.519
2020	2.43
2021	2.344
2022	2.264