Year	Percent
1991	75.134
1992	75.471
1993	75.433
1994	75.351
1995	75.336
1996	75.163
1997	75.076
1998	75.311
1999	75.14
2000	75.103
2001	75.104
2002	75.035
2003	74.988
2004	74.523
2005	73.881
2006	73.385
2007	73.663
2008	73.789
2009	73.653
2010	73.47
2011	74.104
2012	73.672
2013	73.259
2014	73.596
2015	73.173
2016	73.208
2017	73.479
2018	73.774
2019	73.837
2020	73.844
2021	73.837
2022	73.828