Year	Percent
1990	91.297
1991	91.353
1992	91.408
1993	91.44
1994	91.393
1995	91.374
1996	91.396
1997	91.404
1998	91.359
1999	91.32
2000	91.292
2001	91.277
2002	91.248
2003	92.082
2004	92.709
2005	94.633
2006	95.953
2007	95.143
2008	94.057
2009	92.59
2010	93.574
2011	94.928
2012	95.411
2013	92.971
2014	92.188
2015	92.452
2016	91.842
2017	92.037
2018	92.245
2019	92.458
2020	92.668
2021	92.881
2022	93.091
2023	93.299
2024	93.505
2025	93.707
2026	93.906
2027	94.099
2028	94.281
2029	94.441
2030	94.575