Year	Percent
1990	84.38
1991	84.586
1992	84.69
1993	83.126
1994	82.777
1995	85.27
1996	96.875
1997	96.974
1998	96.186
1999	95.778
2000	95.299
2001	95.357
2002	92.588
2003	92.527
2004	93.409
2005	93.597
2006	94.994
2007	95.217
2008	96.114
2009	95.386
2010	95.312
2011	95.544
2012	95.91
2013	95.488
2014	95.906
2015	96.343
2016	95.676
2017	95.843
2018	96.01
2019	96.163
2020	96.29
2021	96.394
2022	96.473
2023	96.537
2024	96.602
2025	96.675
2026	96.752
2027	96.837
2028	96.918
2029	96.98
2030	97.016