Year	Percent
1990	91.089
1991	91.117
1992	91.133
1993	91.143
1994	91.129
1995	91.114
1996	91.151
1997	91.178
1998	91.199
1999	91.215
2000	91.23
2001	91.25
2002	91.267
2003	91.282
2004	91.295
2005	91.307
2006	91.326
2007	91.343
2008	91.358
2009	91.371
2010	91.382
2011	91.382
2012	91.385
2013	91.393
2014	91.404
2015	91.419
2016	91.439
2017	91.448
2018	91.456
2019	91.464
2020	91.472
2021	91.481
2022	91.49
2023	91.501
2024	91.513
2025	91.528
2026	91.544
2027	91.563
2028	91.583
2029	91.603
2030	91.623