Year annual % 1960 -1.74623815710751 1961 1.56299237392687 1962 1.09215017084013 1963 3.08145601867274 1964 4.47210147080726 1965 3.18627450998763 1966 1.78423465718738 1967 2.09184098667308 1968 1.86122448972086 1969 1.25821445737097 1970 2.8808864266098 1971 2.22324794223759 1972 3.61228175799332 1973 5.19320162691133 1974 12.8495477454187 1975 8.3761625062971 1976 4.88341895790898 1977 8.43470771895128 1978 5.74832464618229 1979 12.1353558926061 1980 18.0615430355956 1981 9.40569126142496 1982 8.98262170616892 1983 8.2528116584826 1984 4.72636815920389 1985 3.36267523608605 1986 4.35272383207559 1987 2.48715402223898 1988 4.49125763640182 1989 9.85040925769098 1990 23.3225664366467 1991 33.9722602535864 1992 8.75988625255494 1993 10.748646716372 1994 21.729346883819 1995 29.4645292281585 1996 23.8378353073358 1997 20.1998667554962 1998 13.6681077485869 1999 11.66374097913 2000 11.0480349344976 2001 9.67415556865377 2002 7.69050972034271 2003 7.67416639397937 2004 8.1137909709338 2005 8.80906074819819 2006 5.57775207654298 2007 6.93621470895774 2008 11.4034270813932 2009 5.49634273772208 2010 4.69889064976226 2011 6.7622795731476 2012 5.19618615531848 2013 5.16189898581494 2014 6.12924930313022 2015 3.15783117980923 2016 2.72461223295289 2017 3.93436084442044 2018 4.34734937777528 2019 4.36587159819267 2020 3.46841177951184 2021 4.48087963413445 2022 9.08963911525025 2023 6.66325180347457