Year	Percent
1990	92.279
1991	92.195
1992	92.128
1993	92.042
1994	91.978
1995	91.897
1996	91.83
1997	91.769
1998	91.697
1999	91.626
2000	91.56
2001	91.822
2002	92.074
2003	92.316
2004	92.549
2005	92.773
2006	92.986
2007	93.192
2008	93.39
2009	93.579
2010	93.759
2011	93.932
2012	94.099
2013	94.259
2014	94.175
2015	94.092
2016	94.018
2017	94.11
2018	94.202
2019	94.297
2020	94.392
2021	94.488
2022	94.584
2023	94.682
2024	94.783
2025	94.886
2026	94.99
2027	95.097
2028	95.203
2029	95.306
2030	95.403