Year	Percent
1990	62.489
1991	62.682
1992	62.695
1993	62.591
1994	62.546
1995	62.762
1996	62.903
1997	63.015
1998	63.142
1999	63.222
2000	63.187
2001	63.263
2002	63.186
2003	62.99
2004	62.748
2005	62.516
2006	62.372
2007	62.203
2008	62
2009	61.729
2010	61.367
2011	61.164
2012	60.885
2013	60.546
2014	60.177
2015	59.795
2016	59.538
2017	59.395
2018	59.253
2019	59.111
2020	58.968
2021	58.826
2022	58.683
2023	58.541
2024	58.398
2025	58.256
2026	58.113
2027	57.971
2028	57.828
2029	57.686
2030	57.543