Year	Percent
1990	94.744
1991	94.774
1992	94.795
1993	93.543
1994	92.041
1995	91.666
1996	91.293
1997	90.275
1998	89.412
1999	90.935
2000	91.4
2001	90.686
2002	90.68
2003	90.427
2004	90.631
2005	90.997
2006	90.894
2007	91.962
2008	92.201
2009	92.056
2010	92.557
2011	92.775
2012	93.251
2013	93.214
2014	93.614
2015	94.051
2016	94.469
2017	94.591
2018	94.71
2019	94.813
2020	94.896
2021	94.96
2022	95.005
2023	95.038
2024	95.072
2025	95.115
2026	95.167
2027	95.228
2028	95.295
2029	95.361
2030	95.423