Year	Percent
1991	46.162
1992	42.865
1993	53.272
1994	52.722
1995	57.054
1996	55.832
1997	52.321
1998	49.162
1999	49.267
2000	44.2
2001	44.29
2002	45.864
2003	46.087
2004	47.227
2005	47.339
2006	47.336
2007	48.365
2008	56.402
2009	57.658
2010	56.892
2011	57.347
2012	57.41
2013	57.515
2014	57.694
2015	57.941
2016	58.053
2017	58.016
2018	58.054
2019	58.129
2020	58.138
2021	58.136
2022	58.147