Year	Percent
1990	72.552
1991	72.62
1992	72.689
1993	72.743
1994	72.759
1995	72.729
1996	72.725
1997	72.689
1998	72.618
1999	72.515
2000	72.39
2001	72.333
2002	72.27
2003	72.227
2004	72.105
2005	72.444
2006	72.801
2007	73.223
2008	73.655
2009	73.912
2010	74.245
2011	74.61
2012	74.928
2013	75.205
2014	75.458
2015	75.706
2016	76.003
2017	76.311
2018	76.598
2019	76.813
2020	76.93
2021	76.993
2022	76.972
2023	76.889
2024	76.78
2025	76.668
2026	76.587
2027	76.504
2028	76.429
2029	76.376
2030	76.35