Year	Percent
1991	70.445
1992	69.979
1993	69.553
1994	70.467
1995	71.314
1996	73.11
1997	74.351
1998	75.507
1999	75.069
2000	72.551
2001	73.421
2002	74.239
2003	75.026
2004	75.771
2005	76.488
2006	76.67
2007	76.815
2008	77.432
2009	74.655
2010	71.85
2011	73.809
2012	74.892
2013	74.692
2014	74.477
2015	74.244
2016	73.986
2017	73.862
2018	73.752
2019	73.66
2020	73.591
2021	73.543
2022	73.512