| Year | Value | | 2022 | -1.3558744399305 | | 2021 | 0.22901599447 | | 2020 | 0.070131108925803 | | 2019 | 0.45773000609295 | | 2018 | 0.33901096210321 | | 2017 | 0.75358484273921 | | 2016 | 0.59673407386687 | | 2015 | -1.3649323381159 | | 2014 | 0.29447363086607 | | 2013 | 0.60746794668311 | | 2012 | 0.89525475747381 | | 2011 | 0.85906749231754 | | 2010 | 0.80324896127775 | | 2009 | 0.80317184479312 | | 2008 | 0.80321347756919 | | 2007 | 0.80326183292792 | | 2006 | 0.80320028595336 | | 2005 | 0.067909885374404 | | 2004 | 0.067838626486973 | | 2003 | 0.067884678522228 | | 2002 | 0.067930793124533 | | 2001 | 0.067859323293424 | | 2000 | -3.5821276451817 | | 1999 | -10.955149421099 | | 1998 | -5.9247334853606 | | 1997 | 1.3027928532928 | | 1996 | 1.4677367201975 | | 1995 | 1.5897006409999 | | 1994 | 1.6153809112454 | | 1993 | 1.6936509530898 | | 1992 | 1.775503560259 | | 1991 | 1.9149521332861 | | 1990 | 1.8975901459006 | | 1989 | 1.9901154317295 | | 1988 | 2.1445517139477 | | 1987 | 2.0750024023759 | | 1986 | 2.0595020364582 | | 1985 | 2.1028110355253 | | 1984 | 2.0239881347746 | | 1983 | 2.0025700502295 | | 1982 | 1.9145447584435 | | 1981 | 2.0176408483871 | | 1980 | 1.9920977494554 | | 1979 | 2.1010600062356 | | 1978 | 2.0761991448429 | | 1977 | 2.1202207650603 | | 1976 | 2.2391690314901 | | 1975 | 2.2157479597276 | | 1974 | 2.3423813674028 | | 1973 | 2.3202897079664 | | 1972 | 2.4555689257444 | | 1971 | 2.2709816198765 | | 1970 | 2.3237560125971 | | 1969 | 2.3790416836636 | | 1968 | 2.4370222603161 | | 1967 | 2.5882747833223 | | 1966 | 2.5642430613338 | | 1965 | 2.6317308317373 | | 1964 | 2.7028672387919 | | 1963 | 2.7779564107076 | | 1962 | 2.8573372444056 | | 1961 | 1.986474102644 |
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