Year	Percent
1991	73.241
1992	74.453
1993	75.255
1994	74.583
1995	73.924
1996	72.741
1997	73.241
1998	73.07
1999	69.813
2000	70.664
2001	71.415
2002	68.84
2003	68.536
2004	70.436
2005	72.153
2006	74.01
2007	74.371
2008	74.535
2009	73.525
2010	73.126
2011	73.401
2012	72.956
2013	72.825
2014	73.068
2015	73.06
2016	72.654
2017	71.982
2018	71.717
2019	71.749
2020	71.45
2021	71.124
2022	70.783