Year	Percent
1991	72.161
1992	69.732
1993	72.654
1994	72.681
1995	72.19
1996	72.767
1997	70.914
1998	76.465
1999	74.814
2000	66.212
2001	63.384
2002	66.495
2003	66.428
2004	66.324
2005	67.447
2006	66.237
2007	66.469
2008	68.192
2009	66.739
2010	67.362
2011	66.573
2012	68.023
2013	65.213
2014	64.579
2015	65.61
2016	66.659
2017	66.7
2018	66.661
2019	66.622
2020	66.584
2021	66.548
2022	66.514