Year	Percent
1990	72.793
1991	72.767
1992	72.756
1993	72.756
1994	72.755
1995	72.736
1996	72.733
1997	72.74
1998	72.744
1999	72.743
2000	72.743
2001	72.714
2002	72.692
2003	72.68
2004	72.677
2005	72.683
2006	72.685
2007	72.697
2008	72.716
2009	72.739
2010	72.765
2011	72.781
2012	72.798
2013	72.819
2014	72.846
2015	72.882
2016	72.922
2017	72.993
2018	73.069
2019	73.146
2020	73.22
2021	73.294
2022	73.364
2023	73.434
2024	73.507
2025	73.587
2026	73.672
2027	73.761
2028	73.853
2029	73.943
2030	74.032