Year	Percent
1991	58.267
1992	61.244
1993	55.435
1994	54.992
1995	52.983
1996	52.147
1997	51.264
1998	54.466
1999	54.486
2000	50.117
2001	51.094
2002	49.647
2003	49.426
2004	49.259
2005	53.701
2006	54.727
2007	54.148
2008	52.371
2009	49.704
2010	51.343
2011	49.773
2012	49.763
2013	50.048
2014	49.439
2015	49.123
2016	48.937
2017	48.882
2018	48.824
2019	48.765
2020	48.704
2021	48.642
2022	48.579