Year	Percent
1990	95.732
1991	95.594
1992	95.17
1993	94.706
1994	94.193
1995	93.627
1996	92.991
1997	92.97
1998	92.933
1999	92.879
2000	92.811
2001	92.772
2002	92.717
2003	92.65
2004	92.578
2005	92.509
2006	91.976
2007	91.423
2008	89.797
2009	89.408
2010	88.371
2011	88.224
2012	88.084
2013	87.951
2014	87.825
2015	88.465
2016	89.045
2017	88.933
2018	88.822
2019	88.708
2020	88.588
2021	88.463
2022	88.328
2023	88.175
2024	87.988
2025	87.759
2026	87.49
2027	87.18
2028	86.832
2029	86.45
2030	86.039