Year	Percent
1990	91.233
1991	91.238
1992	91.242
1993	91.259
1994	92.588
1995	89.967
1996	90.718
1997	91.348
1998	91.86
1999	93.082
2000	96.266
2001	98.014
2002	98.166
2003	97.902
2004	97.551
2005	97.069
2006	96.394
2007	96.293
2008	96.471
2009	96.632
2010	96.888
2011	97.389
2012	97.21
2013	96.907
2014	96.232
2015	95.302
2016	95.317
2017	95.382
2018	95.445
2019	95.502
2020	95.551
2021	95.594
2022	95.632
2023	95.661
2024	95.68
2025	95.686
2026	95.686
2027	95.679
2028	95.666
2029	95.652
2030	95.637