Year	Percent
1990	90.343
1991	90.472
1992	90.589
1993	90.58
1994	90.578
1995	90.888
1996	91.143
1997	91.364
1998	91.564
1999	91.757
2000	91.752
2001	91.758
2002	91.761
2003	91.755
2004	91.734
2005	91.691
2006	91.606
2007	91.505
2008	91.384
2009	91.247
2010	91.1
2011	90.966
2012	90.833
2013	90.707
2014	90.132
2015	89.55
2016	89.066
2017	89.086
2018	89.122
2019	89.171
2020	89.233
2021	89.305
2022	89.387
2023	89.473
2024	89.553
2025	89.622
2026	89.679
2027	89.726
2028	89.765
2029	89.8
2030	89.833