Annual
1975-12-31 3.5168
1976-12-31 3.53
1977-12-31 3.53
1978-12-31 3.494
1979-12-31 3.2953
1980-12-31 3.3647
1981-12-31 3.3831
1982-12-31 3.4276
1983-12-31 3.4548
1984-12-31 3.5238
1985-12-31 3.6228
1986-12-31 3.7043
1987-12-31 3.745
1988-12-31 3.745
1989-12-31 3.745
1990-12-31 3.7483
1991-12-31 3.7505
1992-12-31 3.7502
1993-12-31 3.7504
1994-12-31 3.7495
1995-12-31 3.7502
1996-12-31 3.75
1997-12-31 3.7503
1998-12-31 3.7506
1999-12-31 3.7506
2000-12-31 3.7505
2001-12-31 3.7505
2002-12-31 3.7503
2003-12-31 3.7354
2004-12-31 3.7502
2005-12-31 3.7504
2006-12-31 3.7503
2007-12-31 3.7473
2008-12-31 3.7509
2009-12-31 3.7504
2010-12-31 3.7502
2011-12-31 3.7503
2012-12-31 3.7503
2013-12-31 3.7503
2014-12-31 3.7509
2015-12-31 3.7512
2016-12-31 3.7507
2017-12-31 3.7503
2018-12-31 3.7506
2019-12-31 3.7506
2020-12-31 3.7526
2021-12-31 3.7508
2022-12-31 3.7549
2023-12-31 3.7517