Year	Percent
1991	49.894
1992	49.81
1993	50.254
1994	50.012
1995	49.328
1996	48.29
1997	48.214
1998	48.186
1999	49.023
2000	48.197
2001	51.58
2002	51.65
2003	51.627
2004	49.342
2005	49.345
2006	48.098
2007	47.888
2008	48.03
2009	51.544
2010	51.511
2011	50.698
2012	51.053
2013	51.248
2014	50.665
2015	50.191
2016	50.024
2017	50.101
2018	49.875
2019	49.681
2020	49.479
2021	49.277
2022	49.081