Annual
1975-12-31 4.153
1976-12-31 4.3563
1977-12-31 4.4831
1978-12-31 4.5174
1979-12-31 4.2868
1980-12-31 4.2274
1981-12-31 5.0678
1982-12-31 6.2927
1983-12-31 7.6718
1984-12-31 8.2733
1985-12-31 8.5967
1986-12-31 7.1188
1987-12-31 6.3407
1988-12-31 6.1318
1989-12-31 6.448
1990-12-31 5.916
1991-12-31 6.0503
1992-12-31 5.8189
1993-12-31 7.7925
1994-12-31 7.7072
1995-12-31 7.1354
1996-12-31 6.7055
1997-12-31 7.6364
1998-12-31 7.952
1999-12-31 8.2677
2000-12-31 9.1751
2001-12-31 10.3423
2002-12-31 9.7169
2003-12-31 8.0764
2004-12-31 7.347
2005-12-31 7.4825
2006-12-31 7.3756
2007-12-31 6.7573
2008-12-31 6.5968
2009-12-31 7.6496
2010-12-31 7.2043
2011-12-31 6.4981
2012-12-31 6.7727
2013-12-31 6.5144
2014-12-31 6.8641
2015-12-31 8.4368
2016-12-31 8.5641
2017-12-31 8.5424
2018-12-31 8.6996
2019-12-31 9.4595
2020-12-31 9.2037
2021-12-31 8.5821
2022-12-31 10.1237
2023-12-31 10.6188