Year annual % 1961 3.470849865222192 1962 1.9401498185630146 1963 6.745649094945861 1964 9.934816234464066 1965 17.006595272713128 1966 8.15251497850737 1967 -3.8783566049723817 1968 12.616517238007873 1969 11.036816855639458 1970 2.889154491338175 1971 5.182012574172475 1972 15.47255936094254 1973 20.88249211645679 1974 24.568733744708894 1975 29.463523696505547 1976 28.04864973185275 1977 67.2507824057327 1978 73.3066945801153 1979 37.94947817495057 1980 51.126135010279455 1981 75.63356577773249 1982 27.890579069112746 1983 123.06121361640021 1984 35.312424343661036 1985 20.648414986850284 1986 41.705795523684884 1987 39.20149690141099 1988 33.40285418795446 1989 28.29431107717312 1990 31.16658673461862 1991 20.041359240013975 1992 11.150082868787024 1993 31.7572123690249 1994 30.128926968546438 1995 43.04533057778039 1996 39.83774280948353 1997 19.458167588970255 1998 17.04846524513364 1999 13.97116504791201 2000 27.230113843563956 2001 34.81794406633034 2002 22.818584723063708 2003 28.7044072059077 2004 14.350151125041492 2005 14.96371840416299 2006 84.68347182258756 2007 16.104240587274774 2008 19.41027108686835 2009 15.66656862214964 2010 16.595644732234675 2011 13.914822175982081 2012 15.205278739660486 2013 54.01291175839256 2014 23.93995875939987 2015 13.25296668073625 2016 15.748620307899145 2017 10.677308233913934 2018 10.568482495262899 2019 8.481070296987212 2020 9.365574965837382 2021 12.106101631177296 2022 28.168247869122922 2023 33.07982505329542