Year	Percent
1990	64.371
1991	64.789
1992	65.365
1993	66.199
1994	66.533
1995	66.809
1996	66.889
1997	66.69
1998	66.255
1999	65.638
2000	65.767
2001	65.734
2002	65.718
2003	65.662
2004	65.52
2005	65.523
2006	65.514
2007	65.466
2008	65.442
2009	65.437
2010	65.361
2011	65.246
2012	65.182
2013	65.117
2014	65.081
2015	65.105
2016	65.374
2017	65.256
2018	65.127
2019	64.951
2020	64.706
2021	64.389
2022	64.023
2023	63.634
2024	63.259
2025	62.919
2026	62.603
2027	62.33
2028	62.082
2029	61.841
2030	61.594