Year	Percent
1990	62.225
1991	62.185
1992	62.193
1993	62.32
1994	61.96
1995	62.046
1996	61.979
1997	61.739
1998	61.536
1999	61.594
2000	61.372
2001	61.76
2002	62.286
2003	62.263
2004	62.261
2005	62.174
2006	61.837
2007	61.739
2008	61.651
2009	61.783
2010	62.001
2011	62.108
2012	62.152
2013	62.188
2014	62.236
2015	62.471
2016	62.411
2017	62.422
2018	62.459
2019	62.497
2020	62.508
2021	62.43
2022	62.329
2023	62.239
2024	62.186
2025	62.175
2026	62.14
2027	62.139
2028	62.174
2029	62.227
2030	62.276