Year annual % 1960 -3.56219179976055 1961 -3.90000000099988 1962 9.15712799177066 1963 8.57959961876623 1964 2.10711150133545 1965 -1.8916595013061 1966 0.262927256794539 1967 1.23834498871987 1968 0.0359763993382312 1969 0.956628066179126 1970 3.81666666641709 1971 3.58002889678131 1972 8.64073155607574 1973 15.0795349169139 1974 13.1407673714854 1975 14.5017257437616 1976 7.76555023925677 1977 12.8535275054287 1978 3.47785034212178 1979 9.17380513351446 1980 16.7531356897102 1981 7.51463890696157 1982 7.64624306606148 1983 5.62862329448988 1984 20.1516781053536 1985 45.3361755532178 1986 7.6389726657993 1987 13.5507237827822 1988 43.8638323515053 1989 40.6579161175005 1990 50.4624792378524 1991 47.079157410536 1992 4.25902638893392 1993 5.25033880690971 1994 8.26076798575834 1995 12.5359594558963 1996 5.39929385038922 1997 8.29656754792046 1998 4.83166558591895 1999 6.47054186846928 2000 7.72413566181616 2001 8.88306848812961 2002 5.22336769759447 2003 27.4497127394395 2004 51.4608598338065 2005 4.19020260472056 2006 7.57280523853074 2007 6.14356655248047 2008 10.6446210953712 2009 1.44215131834353 2010 6.32993220146146 2011 5.79676809206533 2012 3.69449707884777 2013 4.830950967408 2014 2.99864226125219 2015 0.836746346724557 2016 1.61416607245223 2017 3.27955694678546 2018 3.56443426013508 2019 1.81060377042959 2020 3.78103179915517 2021 8.24300347981809 2022 8.81109209279587 2023 4.78561281021135