Year	Percent
1990	65.763
1991	65.713
1992	65.677
1993	65.637
1994	65.593
1995	65.64
1996	65.672
1997	65.707
1998	65.801
1999	65.883
2000	66.048
2001	66.148
2002	66.271
2003	66.387
2004	66.534
2005	66.714
2006	66.876
2007	66.998
2008	67.172
2009	67.356
2010	67.537
2011	67.599
2012	67.624
2013	67.614
2014	67.599
2015	67.539
2016	67.451
2017	67.4
2018	67.339
2019	67.265
2020	67.18
2021	67.097
2022	67.01
2023	66.928
2024	66.858
2025	66.807
2026	66.778
2027	66.764
2028	66.771
2029	66.8
2030	66.853