Year	Percent
1990	97.274
1991	97.351
1992	97.426
1993	97.378
1994	97.271
1995	97.299
1996	97.171
1997	97.049
1998	96.977
1999	96.919
2000	96.892
2001	96.725
2002	96.613
2003	96.567
2004	96.484
2005	96.396
2006	96.428
2007	96.437
2008	96.581
2009	96.582
2010	96.611
2011	96.577
2012	96.56
2013	96.588
2014	96.594
2015	96.599
2016	96.582
2017	96.612
2018	96.641
2019	96.667
2020	96.687
2021	96.701
2022	96.711
2023	96.715
2024	96.712
2025	96.702
2026	96.687
2027	96.666
2028	96.643
2029	96.619
2030	96.596