Year	Percent
1991	10.746
1992	10.151
1993	9.587
1994	9.101
1995	7.973
1996	8.534
1997	8.683
1998	7.895
1999	7.073
2000	6.363
2001	6.47
2002	6.145
2003	5.979
2004	6.974
2005	5.525
2006	6.234
2007	5.499
2008	5.691
2009	5.579
2010	5.755
2011	6.691
2012	6.301
2013	6.222
2014	5.064
2015	4.758
2016	5.066
2017	5.046
2018	4.981
2019	4.9
2020	4.809
2021	4.676
2022	4.508