Annual
1975-12-31 2.1832
1976-12-31 1.8302
1977-12-31 1.8581
1978-12-31 2.1902
1979-12-31 2.4867
1980-12-31 2.7205
1981-12-31 2.4268
1982-12-31 2.1573
1983-12-31 1.8678
1984-12-31 1.7288
1985-12-31 1.7723
1986-12-31 2.0382
1987-12-31 2.1723
1988-12-31 2.1898
1989-12-31 1.9399
1990-12-31 2.083
1991-12-31 2.0262
1992-12-31 2.1316
1993-12-31 1.9374
1994-12-31 2.0934
1995-12-31 2.1666
1996-12-31 2.1293
1997-12-31 2.268
1998-12-31 2.4596
1999-12-31 2.404
2000-12-31 2.2491
2001-12-31 2.2299
2002-12-31 2.3609
2003-12-31 2.2877
2004-12-31 2.3831
2005-12-31 2.2048
2006-12-31 2.09
2007-12-31 2.1467
2008-12-31 1.9621
2009-12-31 1.78
2010-12-31 1.5925
2011-12-31 1.5862
2012-12-31 1.5839
2013-12-31 1.612
2014-12-31 1.8188
2015-12-31 1.9552
2016-12-31 1.7948
2017-12-31 1.6716
2018-12-31 1.7293
2019-12-31 1.6938
2020-12-31 1.72
2021-12-31 1.7245
2022-12-31 1.6074
2023-12-31 1.6779