Year	Percent
1991	76.712
1992	76.784
1993	76.724
1994	76.201
1995	76.598
1996	76.775
1997	77.032
1998	76.852
1999	76.681
2000	76.384
2001	76.058
2002	77.386
2003	76.695
2004	79.686
2005	81.465
2006	80.32
2007	78.832
2008	77.885
2009	77.591
2010	75.761
2011	74.061
2012	71.667
2013	73.94
2014	75.595
2015	76.714
2016	76.623
2017	76.721
2018	76.551
2019	76.283
2020	75.975
2021	75.696
2022	75.409