Year	Percent
1990	63.599
1991	63.382
1992	62.792
1993	62.753
1994	62.413
1995	62.147
1996	62.314
1997	62.697
1998	62.871
1999	63.176
2000	64.421
2001	65.175
2002	65.549
2003	65.337
2004	65.219
2005	65.067
2006	64.824
2007	64.56
2008	64.312
2009	64.769
2010	64.534
2011	63.938
2012	63.783
2013	63.714
2014	63.726
2015	63.614
2016	63.549
2017	63.495
2018	63.442
2019	63.384
2020	63.321
2021	63.269
2022	63.213
2023	63.154
2024	63.099
2025	63.052
2026	63.024
2027	63.002
2028	62.983
2029	62.966
2030	62.948