Year	Percent
1990	73.021
1991	72.942
1992	72.967
1993	73.039
1994	73.14
1995	73.343
1996	73.355
1997	73.473
1998	73.665
1999	73.895
2000	74.134
2001	74.316
2002	74.531
2003	74.76
2004	75.089
2005	75.475
2006	75.805
2007	76.162
2008	76.55
2009	76.957
2010	77.345
2011	77.977
2012	78.092
2013	78.44
2014	78.749
2015	78.842
2016	78.981
2017	79.041
2018	79.053
2019	79.02
2020	78.945
2021	78.82
2022	78.664
2023	78.473
2024	78.246
2025	77.982
2026	77.681
2027	77.355
2028	77.017
2029	76.686
2030	76.372