Year	Percent
1991	52.243
1992	51.427
1993	50.975
1994	51.317
1995	51.635
1996	51.493
1997	52.003
1998	53.082
1999	53.966
2000	54.722
2001	54.906
2002	55.847
2003	56.77
2004	57.057
2005	56.992
2006	57.471
2007	58.392
2008	58.484
2009	57.543
2010	57.379
2011	57.284
2012	57.415
2013	57.616
2014	57.186
2015	56.949
2016	57.013
2017	57.139
2018	57.275
2019	57.122
2020	56.96
2021	56.79
2022	56.604