Year	Percent
1991	57.619
1992	49.504
1993	47.372
1994	48.173
1995	47.146
1996	48.426
1997	48.974
1998	49.525
1999	48.725
2000	47.247
2001	47.896
2002	48.563
2003	48.56
2004	49.657
2005	49.623
2006	49.821
2007	51.201
2008	52.484
2009	50.318
2010	50.048
2011	50.385
2012	50.729
2013	49.189
2014	47.867
2015	48.44
2016	48.952
2017	48.839
2018	48.654
2019	48.439
2020	48.29
2021	48.133
2022	47.953