Year	Percent
1991	47.329
1992	47.829
1993	48.252
1994	48.183
1995	48.203
1996	49.533
1997	49.666
1998	50.116
1999	50.798
2000	50.637
2001	50.63
2002	50.488
2003	50.427
2004	50.026
2005	49.571
2006	49.384
2007	49.009
2008	48.779
2009	48.253
2010	47.159
2011	46.977
2012	45.664
2013	44.428
2014	44.928
2015	42.425
2016	42.176
2017	42.029
2018	41.966
2019	41.909
2020	41.853
2021	41.799
2022	41.747