Year annual % 1961 1.11138977039487 1962 1.34156955956572 1963 1.37847716433837 1964 1.43767537202878 1965 1.35945837225877 1966 1.0780067078473 1967 0.787736186645794 1968 0.925837506546126 1969 1.04878181744335 1970 1.09614545086791 1971 1.233395893442 1972 1.12390796531781 1973 0.960032301392228 1974 0.865266081367352 1975 0.785459176187127 1976 0.712743106958176 1977 0.73604373010673 1978 0.685613146650277 1979 0.556254915149304 1980 0.60335223799787 1981 0.704718276463133 1982 0.719876655375138 1983 0.687096401884296 1984 0.652187283315182 1985 0.667063356294738 1986 0.743509962008971 1987 0.778102309212138 1988 0.621622035077344 1989 0.398143547527793 1990 0.0664901906843683 1991 -0.502159185195728 1992 -1.82418155532121 1993 -2.57431997803655 1994 -2.13858863504971 1995 -1.78539953576165 1996 -1.47536463752721 1997 -1.14091924023266 1998 -0.960559004588775 1999 0.294482275915173 2000 0.483707161729931 2001 -0.63696312445507 2002 -0.633433796423808 2003 -0.627622448059203 2004 -0.597820510395586 2005 -0.572255524659659 2006 -0.589655559840225 2007 -0.456188535090031 2008 -0.268133719541207 2009 -0.192768077420229 2010 -0.22805796852935 2011 -0.303582823643979 2012 -0.357944411443807 2013 -0.355891802625531 2014 -0.262256175097854 2015 0.0655525295417938 2016 0.0291122255540077 2017 0.121070631466687 2018 0.348039137980543 2019 0.371554389037477 2020 0.197559185177642 2021 0.105996956310127 2022 1.33655151148286 2023 1.27794159737588