Year	Percent
1991	57.858
1992	56.037
1993	58.552
1994	57.669
1995	60.331
1996	58.549
1997	60.925
1998	62.093
1999	62.734
2000	63.277
2001	64.477
2002	63.34
2003	61.594
2004	62.1
2005	62.159
2006	64.153
2007	63.745
2008	63.591
2009	60.244
2010	60.162
2011	59.28
2012	60.453
2013	58.009
2014	59.753
2015	60.992
2016	60.031
2017	60.331
2018	60.578
2019	61.558
2020	61.805
2021	61.816
2022	61.724