Annual
1975-12-31 0.9831
1976-12-31 1.0145
1977-12-31 1.0639
1978-12-31 1.1404
1979-12-31 1.1718
1980-12-31 1.1686
1981-12-31 1.1987
1982-12-31 1.2339
1983-12-31 1.2323
1984-12-31 1.2951
1985-12-31 1.3652
1986-12-31 1.3894
1987-12-31 1.3257
1988-12-31 1.2303
1989-12-31 1.1839
1990-12-31 1.1666
1991-12-31 1.1455
1992-12-31 1.2086
1993-12-31 1.2902
1994-12-31 1.3656
1995-12-31 1.3727
1996-12-31 1.3636
1997-12-31 1.3843
1998-12-31 1.4838
1999-12-31 1.4857
2000-12-31 1.4855
2001-12-31 1.5486
2002-12-31 1.5706
2003-12-31 1.4006
2004-12-31 1.3013
2005-12-31 1.2115
2006-12-31 1.1343
2007-12-31 1.0734
2008-12-31 1.0673
2009-12-31 1.1406
2010-12-31 1.0302
2011-12-31 0.9899
2012-12-31 0.9994
2013-12-31 1.0303
2014-12-31 1.1044
2015-12-31 1.2792
2016-12-31 1.3253
2017-12-31 1.2978
2018-12-31 1.2962
2019-12-31 1.3267
2020-12-31 1.341