Year	Percent
1990	66.226
1991	66.149
1992	66.04
1993	66.001
1994	66.01
1995	66.046
1996	65.94
1997	65.909
1998	65.883
1999	65.862
2000	65.81
2001	65.78
2002	65.748
2003	65.655
2004	65.656
2005	65.633
2006	65.666
2007	65.692
2008	65.69
2009	65.672
2010	65.65
2011	65.664
2012	65.632
2013	65.168
2014	65.025
2015	64.881
2016	64.867
2017	64.811
2018	64.759
2019	64.715
2020	64.682
2021	64.71
2022	64.759
2023	64.822
2024	64.894
2025	64.972
2026	65.062
2027	65.153
2028	65.245
2029	65.34
2030	65.438