Year	Percent
1990	64.451
1991	64.526
1992	64.59
1993	64.724
1994	64.922
1995	65.18
1996	65.395
1997	65.552
1998	65.745
1999	65.976
2000	66.691
2001	67.475
2002	68.28
2003	69.063
2004	69.766
2005	70.355
2006	70.819
2007	71.193
2008	71.519
2009	71.846
2010	72.199
2011	72.604
2012	73.032
2013	73.471
2014	73.888
2015	74.261
2016	74.608
2017	74.684
2018	74.719
2019	74.752
2020	74.807
2021	74.886
2022	74.979
2023	75.078
2024	75.171
2025	75.254
2026	75.338
2027	75.42
2028	75.504
2029	75.593
2030	75.691