Year	Percent
1991	50.695
1992	51.132
1993	50.891
1994	50.888
1995	50.2
1996	49.747
1997	49.375
1998	49.037
1999	49.54
2000	35.736
2001	36.157
2002	36.018
2003	35.956
2004	35.442
2005	34.859
2006	34.976
2007	34.438
2008	34.217
2009	35.036
2010	33.812
2011	33.195
2012	33.176
2013	33.096
2014	33.3
2015	33.791
2016	34.132
2017	34.569
2018	34.593
2019	34.608
2020	34.62
2021	34.627
2022	34.632