Year	Percent
1990	62.649
1991	62.466
1992	61.97
1993	61.948
1994	61.664
1995	61.44
1996	61.583
1997	61.909
1998	62.055
1999	62.315
2000	63.373
2001	64.005
2002	64.32
2003	64.149
2004	64.052
2005	63.92
2006	63.703
2007	63.466
2008	63.244
2009	63.605
2010	63.402
2011	62.895
2012	62.751
2013	62.68
2014	62.676
2015	62.574
2016	62.514
2017	62.465
2018	62.417
2019	62.364
2020	62.304
2021	62.251
2022	62.192
2023	62.13
2024	62.07
2025	62.015
2026	61.976
2027	61.941
2028	61.908
2029	61.876
2030	61.844