Year	Percent
1990	82.033
1991	82.069
1992	82.086
1993	82.119
1994	82.203
1995	82.257
1996	82.337
1997	82.7
1998	83.816
1999	83.731
2000	84.977
2001	84.624
2002	85.774
2003	84.753
2004	86.385
2005	86.445
2006	86.976
2007	87.19
2008	88.484
2009	87.989
2010	88.177
2011	88.404
2012	89.071
2013	88.669
2014	88.258
2015	88.526
2016	88.902
2017	89.025
2018	89.156
2019	89.291
2020	89.427
2021	89.563
2022	89.698
2023	89.83
2024	89.959
2025	90.085
2026	90.208
2027	90.33
2028	90.448
2029	90.554
2030	90.638