Year	Percent
1991	72.161
1992	70.719
1993	69.743
1994	69.594
1995	69.728
1996	70.744
1997	71.262
1998	70.968
1999	71.512
2000	71.775
2001	72.131
2002	71.619
2003	72.308
2004	74.2
2005	73.921
2006	73.915
2007	73.519
2008	73.656
2009	73.234
2010	73.889
2011	73.509
2012	71.371
2013	70.687
2014	69.844
2015	69.951
2016	71.887
2017	71.629
2018	71.737
2019	71.902
2020	72.117
2021	72.358
2022	72.63