Year	Percent
1990	96.918
1991	96.998
1992	97.081
1993	97.028
1994	97.024
1995	97.187
1996	97.325
1997	97.443
1998	97.544
1999	97.631
2000	97.696
2001	97.747
2002	97.786
2003	97.813
2004	97.828
2005	97.83
2006	97.794
2007	97.755
2008	97.715
2009	97.676
2010	97.638
2011	97.599
2012	97.56
2013	97.519
2014	97.378
2015	97.232
2016	97.105
2017	97.086
2018	97.065
2019	97.045
2020	97.027
2021	97.009
2022	96.993
2023	96.978
2024	96.966
2025	96.958
2026	96.951
2027	96.947
2028	96.946
2029	96.946
2030	96.947