Year	Percent
1992	72.37249
1993	72.30517
1994	72.25511
1995	72.2413
1996	72.21887
1997	72.24303
1998	71.8236
1999	71.55088
2000	71.46975
2001	71.4335
2002	71.45372
2003	71.38295
2004	71.38123
2005	71.29
2006	71.25794
2007	71.23056
2008	71.27667
2009	71.24905
2010	71.23352
2011	71.25768
2012	71.2853
2013	71.68059
2014	71.65841
2015	71.65323
2016	71.66531
2017	71.6192
2018	71.33069
2019	71.29962
2020	71.29962
2021	71.29962