Year	Percent
1990	90.056
1991	90.062
1992	90.076
1993	90.051
1994	90.074
1995	90.077
1996	90.102
1997	90.041
1998	91.036
1999	90.167
2000	88.467
2001	88.502
2002	90.494
2003	89.231
2004	90.31
2005	89.134
2006	90.191
2007	91.612
2008	92.01
2009	91.129
2010	90.999
2011	90.872
2012	91.239
2013	90.642
2014	90.515
2015	90.646
2016	90.223
2017	90.372
2018	90.527
2019	90.673
2020	90.801
2021	90.918
2022	91.017
2023	91.102
2024	91.181
2025	91.258
2026	91.336
2027	91.409
2028	91.475
2029	91.533
2030	91.583