Year	Percent
1990	94.412
1991	93.884
1992	93.76
1993	94.084
1994	94.648
1995	94.638
1996	94.991
1997	94.685
1998	94.576
1999	94.73
2000	94.591
2001	94.215
2002	94.328
2003	94.3
2004	94.754
2005	94.664
2006	94.77
2007	94.622
2008	94.414
2009	94.47
2010	94.235
2011	93.581
2012	93.636
2013	93.588
2014	93.166
2015	93.176
2016	93.275
2017	93.206
2018	93.125
2019	93.039
2020	92.952
2021	92.863
2022	92.774
2023	92.683
2024	92.591
2025	92.498
2026	92.405
2027	92.313
2028	92.224
2029	92.139
2030	92.058