Year	Percent
1991	44.472
1992	49.304
1993	52.764
1994	50.4
1995	50.491
1996	48.692
1997	48.502
1998	49.122
1999	51.241
2000	47.285
2001	44.889
2002	45.713
2003	47.038
2004	48.636
2005	49.99
2006	49.917
2007	54.197
2008	58.37
2009	57.666
2010	55.978
2011	52.545
2012	55.606
2013	55.968
2014	53.102
2015	53.145
2016	52.966
2017	52.753
2018	52.589
2019	52.431
2020	52.23
2021	52.002
2022	51.746