Year	Percent
1990	93.293
1991	93.156
1992	92.846
1993	92.49
1994	92.007
1995	91.765
1996	91.593
1997	91.761
1998	91.091
1999	90.729
2000	91.102
2001	90.975
2002	91.233
2003	90.744
2004	91.41
2005	92.266
2006	92.272
2007	92.078
2008	91.74
2009	91.267
2010	91.644
2011	91.658
2012	90.958
2013	91.567
2014	92.217
2015	91.966
2016	92.883
2017	92.876
2018	92.874
2019	92.877
2020	92.885
2021	92.898
2022	92.916
2023	92.938
2024	92.961
2025	92.983
2026	93.002
2027	93.018
2028	93.028
2029	93.03
2030	93.019