Year	Percent
1990	75.151
1991	75.106
1992	74.994
1993	74.762
1994	74.691
1995	74.664
1996	74.7
1997	74.724
1998	74.742
1999	74.74
2000	74.732
2001	74.76
2002	74.722
2003	74.735
2004	74.776
2005	74.854
2006	74.986
2007	75.115
2008	75.205
2009	75.245
2010	75.283
2011	75.343
2012	75.393
2013	75.432
2014	75.436
2015	75.402
2016	75.334
2017	75.324
2018	75.307
2019	75.287
2020	75.27
2021	75.251
2022	75.235
2023	75.229
2024	75.24
2025	75.272
2026	75.321
2027	75.389
2028	75.47
2029	75.56
2030	75.654