Year	Percent
1990	86.229
1991	86.275
1992	86.363
1993	86.488
1994	86.519
1995	86.539
1996	86.53
1997	86.544
1998	86.584
1999	86.646
2000	86.77
2001	86.953
2002	87.194
2003	87.464
2004	87.731
2005	88.368
2006	88.867
2007	89.496
2008	90.101
2009	91.451
2010	89.887
2011	89.9
2012	89.909
2013	89.913
2014	89.914
2015	89.902
2016	89.893
2017	89.965
2018	90.043
2019	90.133
2020	90.235
2021	90.347
2022	90.477
2023	90.614
2024	90.741
2025	90.845
2026	90.918
2027	90.956
2028	90.969
2029	90.981
2030	91.012