Year	Percent
1990	63.435
1991	63.853
1992	64.405
1993	65.035
1994	65.518
1995	65.913
1996	66.195
1997	66.378
1998	66.483
1999	66.582
2000	66.664
2001	66.759
2002	66.84
2003	66.896
2004	66.897
2005	66.844
2006	66.72
2007	66.534
2008	66.336
2009	66.176
2010	66.03
2011	65.949
2012	65.935
2013	65.968
2014	66.011
2015	66.038
2016	66.018
2017	65.982
2018	65.942
2019	65.907
2020	65.882
2021	65.827
2022	65.776
2023	65.726
2024	65.665
2025	65.59
2026	65.469
2027	65.332
2028	65.198
2029	65.092
2030	65.025