Year	Percent
1991	49.125
1992	30.949
1993	47.815
1994	62.147
1995	63.645
1996	61.022
1997	58.583
1998	66.895
1999	64.739
2000	65.124
2001	66.743
2002	68.854
2003	67.629
2004	64.836
2005	65.852
2006	64.457
2007	63.891
2008	58.366
2009	47.297
2010	49.678
2011	49.128
2012	47.399
2013	47.946
2014	46.217
2015	42.873
2016	40.841
2017	44.342
2018	44.037
2019	44.028
2020	44.009
2021	44.068
2022	44.247