Year annual % 1961 -3.6558317516409033 1962 2.0915622928210524 1963 0.4036000574409826 1964 4.08310518698201 1965 10.589055028760214 1966 23.641851601549547 1967 0.2628744591384162 1968 15.939905444087472 1969 22.94620978622777 1970 -11.394405743846377 1971 -7.496523753137836 1972 3.710510970045263 1973 19.88984738396975 1974 10.82214968633275 1975 -14.169898584360496 1976 15.204586982500317 1977 8.254018426919771 1978 12.681487906082793 1979 21.889066983297084 1980 11.762915649675662 1981 7.158618024855556 1982 6.138601292646072 1983 18.62934635180531 1984 18.331231799031997 1985 41.137350508031545 1986 81.98835669938671 1987 62.012898264580116 1988 34.490304448445386 1989 80.87733473049224 1990 106.38892004329054 1991 92.6545782085704 1992 165.5339538079205 1993 143.6583416575546 1994 80.74219864601025 1995 30.61112475957424 1996 24.349259559526317 1997 25.402541259163698 1998 16.906872813821778 1999 17.923873066351433 2000 32.613870511728805 2001 25.331258462241408 2002 19.390923266941 2003 17.607723683992276 2004 19.716823205593784 2005 16.650199072887247 2006 14.542252675954344 2007 12.970210733581695 2008 10.640244817069402 2009 5.559685660255866 2010 13.950913193451896 2011 11.10741330686038 2012 6.992227224281038 2013 9.730891229368964 2014 5.440524560627466 2015 6.659292113573429 2016 13.576101168141562 2017 10.072837086733259 2018 7.411570948432569 2019 7.6334704807674285 2020 13.91387062184117 2021 25.142777610484373 2022 6.101594713397773 2023 8.885082556699757