Year	Percent
1990	71.465
1991	71.536
1992	71.697
1993	71.869
1994	72
1995	72.098
1996	72.212
1997	72.32
1998	72.42
1999	72.506
2000	72.575
2001	72.603
2002	72.619
2003	72.634
2004	72.67
2005	72.686
2006	72.715
2007	72.777
2008	72.827
2009	73.437
2010	72.53
2011	72.961
2012	72.506
2013	72.287
2014	72.918
2015	72.405
2016	71.266
2017	71.419
2018	71.598
2019	71.795
2020	72.008
2021	72.24
2022	72.496
2023	72.774
2024	73.064
2025	73.356
2026	73.644
2027	73.929
2028	74.202
2029	74.453
2030	74.675