Year	Percent
1991	57.142
1992	54.386
1993	53.398
1994	54.084
1995	54.321
1996	53.32
1997	52.807
1998	53.016
1999	55.349
2000	56.751
2001	56.451
2002	57.303
2003	57.645
2004	57.392
2005	56.666
2006	57.749
2007	59.244
2008	59.202
2009	53.688
2010	53.423
2011	54.387
2012	53.175
2013	54.091
2014	54.176
2015	54.424
2016	54.069
2017	54.943
2018	55.402
2019	55.154
2020	54.829
2021	54.435
2022	53.992