Year	Percent
1990	89.983
1991	89.988
1992	89.987
1993	89.978
1994	89.97
1995	89.954
1996	89.947
1997	89.761
1998	89.541
1999	89.288
2000	89.465
2001	89.621
2002	89.748
2003	89.216
2004	86.779
2005	88.253
2006	91.077
2007	90.373
2008	91.824
2009	92.661
2010	93.295
2011	92.022
2012	92.146
2013	91.876
2014	93.168
2015	91.815
2016	92.141
2017	92.289
2018	92.437
2019	92.589
2020	92.746
2021	92.909
2022	93.077
2023	93.245
2024	93.406
2025	93.556
2026	93.696
2027	93.826
2028	93.949
2029	94.069
2030	94.191