Year	Percent
1991	51.602
1992	51.866
1993	51.796
1994	50.465
1995	57.628
1996	57.012
1997	57.112
1998	56.058
1999	59.057
2000	61.907
2001	60.953
2002	60.511
2003	60.478
2004	61.828
2005	61.651
2006	55.668
2007	54.227
2008	55.316
2009	55.417
2010	54.758
2011	55.329
2012	54.878
2013	54.645
2014	54.38
2015	54.036
2016	53.848
2017	53.727
2018	53.617
2019	53.502
2020	53.389
2021	53.273
2022	53.159