Annual
1975-12-31 0.8367
1976-12-31 1.0099
1977-12-31 1.032
1978-12-31 0.9651
1979-12-31 0.9797
1980-12-31 1.0269
1981-12-31 1.1548
1982-12-31 1.3343
1983-12-31 1.4994
1984-12-31 1.7661
1985-12-31 2.0207
1986-12-31 1.9122
1987-12-31 1.6915
1988-12-31 1.5283
1989-12-31 1.6745
1990-12-31 1.6773
1991-12-31 1.7304
1992-12-31 1.8598
1993-12-31 1.8491
1994-12-31 1.6855
1995-12-31 1.5244
1996-12-31 1.4541
1997-12-31 1.5135
1998-12-31 1.8684
1999-12-31 1.8905
2000-12-31 2.2059
2001-12-31 2.3804
2002-12-31 2.1613
2003-12-31 1.7213
2004-12-31 1.5079
2005-12-31 1.4202
2006-12-31 1.5429
2007-12-31 1.3605
2008-12-31 1.4259
2009-12-31 1.5968
2010-12-31 1.3871
2011-12-31 1.2661
2012-12-31 1.2345
2013-12-31 1.2202
2014-12-31 1.206
2015-12-31 1.4364
2016-12-31 1.4354
2017-12-31 1.4071
2018-12-31 1.4464
2019-12-31 1.5183
2020-12-31 1.5403
2021-12-31 1.4145
2022-12-31 1.5789
2023-12-31 1.63