Year	Percent
1990	76.212
1991	76.293
1992	76.394
1993	76.514
1994	76.631
1995	76.76
1996	76.812
1997	76.849
1998	76.861
1999	76.85
2000	76.79
2001	76.681
2002	76.529
2003	76.354
2004	76.167
2005	75.979
2006	75.749
2007	75.535
2008	75.343
2009	75.164
2010	74.975
2011	74.776
2012	74.583
2013	74.419
2014	74.311
2015	74.268
2016	74.248
2017	74.281
2018	74.345
2019	74.418
2020	74.486
2021	74.547
2022	74.605
2023	74.666
2024	74.737
2025	74.821
2026	74.907
2027	75.004
2028	75.106
2029	75.204
2030	75.293