Year	Percent
1990	65.21
1991	64.897
1992	64.577
1993	64.463
1994	64.316
1995	63.601
1996	62.925
1997	62.389
1998	63.112
1999	63.818
2000	64.49
2001	64.591
2002	64.62
2003	64.583
2004	64.492
2005	64.361
2006	64.274
2007	64.149
2008	64.009
2009	63.888
2010	63.81
2011	63.943
2012	64.138
2013	64.385
2014	64.67
2015	64.586
2016	64.811
2017	65.19
2018	65.572
2019	65.937
2020	66.273
2021	66.569
2022	66.839
2023	67.07
2024	67.244
2025	67.354
2026	67.398
2027	67.384
2028	67.342
2029	67.315
2030	67.324