Year	Percent
1990	59.405
1991	59.41
1992	59.393
1993	59.321
1994	59.297
1995	59.339
1996	59.306
1997	59.35
1998	59.381
1999	59.384
2000	59.4
2001	59.405
2002	59.409
2003	59.409
2004	59.409
2005	59.404
2006	59.404
2007	59.393
2008	59.378
2009	59.361
2010	59.331
2011	59.27
2012	59.217
2013	59.182
2014	59.108
2015	59.049
2016	59.043
2017	59.026
2018	59.01
2019	58.993
2020	58.976
2021	58.96
2022	58.943
2023	58.926
2024	58.91
2025	58.893
2026	58.876
2027	58.86
2028	58.843
2029	58.826
2030	58.81