Year	Percent
1991	54.39
1992	54.155
1993	53.762
1994	53.334
1995	54.712
1996	52.337
1997	50.971
1998	49.307
1999	48.951
2000	49.059
2001	47.152
2002	46.595
2003	46.273
2004	48.155
2005	49.274
2006	50.525
2007	50.851
2008	51.461
2009	48.551
2010	46.634
2011	46.325
2012	46.541
2013	46.575
2014	46.608
2015	47.534
2016	46.803
2017	46.169
2018	46.129
2019	45.958
2020	46.152
2021	46.248
2022	46.313