Year	Percent
1990	90.443
1991	90.538
1992	90.698
1993	90.797
1994	90.827
1995	90.836
1996	90.897
1997	90.956
1998	91.009
1999	91.03
2000	90.797
2001	90.546
2002	90.284
2003	90.006
2004	89.695
2005	89.332
2006	88.905
2007	88.4
2008	88.686
2009	88.904
2010	89.069
2011	89.192
2012	89.316
2013	90.1
2014	89.423
2015	89.453
2016	90.546
2017	90.402
2018	90.277
2019	90.187
2020	90.143
2021	90.139
2022	90.183
2023	90.269
2024	90.383
2025	90.515
2026	90.656
2027	90.81
2028	90.968
2029	91.116
2030	91.244