Year	Percent
1990	95.561
1991	95.109
1992	94.92
1993	95.119
1994	95.113
1995	95.447
1996	94.478
1997	95.417
1998	95.813
1999	95.556
2000	95.104
2001	95.951
2002	96.088
2003	95.893
2004	95.714
2005	96.744
2006	95.777
2007	95.754
2008	96.106
2009	95.778
2010	94.841
2011	95.218
2012	94.551
2013	94.427
2014	93.895
2015	93.421
2016	92.969
2017	92.954
2018	92.94
2019	92.924
2020	92.905
2021	92.883
2022	92.858
2023	92.828
2024	92.796
2025	92.761
2026	92.725
2027	92.689
2028	92.653
2029	92.617
2030	92.579