Year	Percent
1990	71.776
1991	72.131
1992	72.483
1993	72.845
1994	72.979
1995	72.942
1996	73.121
1997	73.272
1998	73.286
1999	73.304
2000	73.366
2001	73.512
2002	73.565
2003	73.569
2004	73.542
2005	73.506
2006	73.626
2007	73.678
2008	73.695
2009	73.743
2010	73.733
2011	73.837
2012	73.894
2013	73.888
2014	73.818
2015	73.707
2016	73.703
2017	73.708
2018	73.705
2019	73.695
2020	73.68
2021	73.663
2022	73.644
2023	73.63
2024	73.624
2025	73.63
2026	73.647
2027	73.676
2028	73.721
2029	73.786
2030	73.873