Year	Percent
1991	53.474
1992	53.092
1993	53.882
1994	53.254
1995	53.322
1996	53.139
1997	52.578
1998	51.724
1999	51.125
2000	51.442
2001	50.898
2002	50.167
2003	49.546
2004	48.754
2005	48.833
2006	48.314
2007	47.314
2008	47.974
2009	48.8
2010	48.441
2011	47.484
2012	47.292
2013	47.143
2014	46.853
2015	47.293
2016	47.414
2017	47.347
2018	47.25
2019	47.153
2020	47.056
2021	46.96
2022	46.867