Year	Percent
1990	76.213
1991	76.165
1992	76.049
1993	75.816
1994	75.735
1995	75.697
1996	75.729
1997	75.747
1998	75.758
1999	75.747
2000	75.728
2001	75.753
2002	75.712
2003	75.719
2004	75.752
2005	75.82
2006	75.946
2007	76.069
2008	76.154
2009	76.189
2010	76.221
2011	76.276
2012	76.319
2013	76.352
2014	76.357
2015	76.331
2016	76.278
2017	76.285
2018	76.285
2019	76.281
2020	76.277
2021	76.268
2022	76.259
2023	76.258
2024	76.275
2025	76.316
2026	76.374
2027	76.451
2028	76.544
2029	76.645
2030	76.75