Year	Percent
1990	94.217
1991	94.286
1992	92.936
1993	93.221
1994	93.082
1995	92.918
1996	92.956
1997	92.805
1998	92.772
1999	92.914
2000	93.175
2001	91.805
2002	92.063
2003	92.44
2004	92.476
2005	92.312
2006	92.453
2007	92.516
2008	92.44
2009	92.171
2010	92.437
2011	92.498
2012	92.579
2013	92.439
2014	92.548
2015	92.598
2016	92.478
2017	92.445
2018	92.406
2019	92.364
2020	92.322
2021	92.279
2022	92.238
2023	92.197
2024	92.157
2025	92.118
2026	92.08
2027	92.044
2028	92.011
2029	91.985
2030	91.969