Year annual % 1961 3.0833333333337056 1962 7.6517521352498745 1963 22.417395846936905 1964 12.8500560089616 1965 3.6467196067310756 1966 9.114126097366213 1967 2.165008777062817 1968 4.215758468335477 1969 10.27890635733814 1970 5.981917203573577 1971 10.532856399146807 1972 22.62416627417635 1973 18.644529798042434 1974 16.570939242674275 1975 21.18502857757135 1976 30.872895013084605 1977 13.172387692968126 1978 11.868315057622231 1979 9.115893921547604 1980 4.806434202348935 1981 10.569476792951903 1982 6.75864015666094 1983 10.853686750174013 1984 15.732983466422246 1985 29.117934978618166 1986 -37.74765068534147 1987 5.825040462798263 1988 12.192979799509374 1989 13.332433526791739 1990 -17.513645713103198 1991 18.8607408185417 1992 15.533363324518373 1993 33.47084199469634 1994 40.443783272535526 1995 11.949887415233214 1996 13.800747490762525 1997 10.553889548846609 1998 8.975970405128528 1999 8.802267683901704 2000 1.5635409888050142 2001 26.479934350799756 2002 -2.100009832304522 2003 1.975606286669933 2004 3.6091928584989565 2005 3.8525778553780023 2006 10.493428308995444 2007 17.361816393133232 2008 -1.1550994142263653 2009 2.1944954106620442 2010 0.14460228244653636 2011 -2.070142313720844 2012 1.2892719009373759 2013 2.4105960790569987 2014 0.31323975501435714 2015 6.924610650553522 2016 3.0474606051697126 2017 11.121117656004348 2018 6.068670563113594 2019 11.305169820853948 2020 8.872353951077235 2021 2.257990857473988 2022 4.649609973414895 2023 8.883593925120433