Year	Percent
1990	63.032
1991	62.951
1992	62.873
1993	62.81
1994	62.751
1995	62.714
1996	62.681
1997	62.676
1998	62.677
1999	62.692
2000	62.704
2001	62.705
2002	62.729
2003	62.735
2004	62.758
2005	62.795
2006	62.789
2007	62.787
2008	62.817
2009	62.817
2010	62.842
2011	62.868
2012	62.905
2013	62.936
2014	62.953
2015	62.965
2016	62.998
2017	63.016
2018	63.036
2019	63.061
2020	63.092
2021	63.117
2022	63.148
2023	63.186
2024	63.23
2025	63.279
2026	63.33
2027	63.388
2028	63.452
2029	63.52
2030	63.59