Year	Percent
1990	89.657
1991	89.825
1992	89.988
1993	89.949
1994	89.95
1995	90.098
1996	90.185
1997	90.228
1998	90.241
1999	90.244
2000	90.367
2001	90.48
2002	90.591
2003	90.693
2004	90.774
2005	90.83
2006	90.705
2007	90.56
2008	90.396
2009	90.221
2010	90.021
2011	89.838
2012	89.666
2013	89.492
2014	88.896
2015	88.296
2016	87.796
2017	87.82
2018	87.861
2019	87.914
2020	87.977
2021	88.046
2022	88.125
2023	88.207
2024	88.285
2025	88.352
2026	88.406
2027	88.452
2028	88.489
2029	88.52
2030	88.546