Year annual % 1961 0.03627668638344517 1962 0.2865041335245593 1963 1.5257202966643604 1964 1.9000000047953733 1965 2.2316014186618105 1966 7.360654374882941 1967 8.557463493268997 1968 5.249288001531056 1969 4.937539644022124 1970 5.651362943763516 1971 3.413529528745812 1972 7.132566428960757 1973 19.7375060864035 1974 8.920026897532438 1975 2.2693125052702783 1976 19.718063396656532 1977 7.437825157039441 1978 -2.0304731402475085 1979 16.099842045489552 1980 7.091315072002175 1981 -1.3036023608364218 1982 3.678801546165758 1983 18.659960358785384 1984 7.438292908189894 1985 1.620138341237265 1986 1.356869087636639 1987 7.971599960060203 1988 7.924236984849188 1989 -2.540653147468376 1990 4.1382315864978665 1991 6.994854891057798 1992 2.875981286851186 1993 -2.495802465214595 1994 7.253088482422342 1995 15.851330793603438 1996 1.8118781249523863 1997 8.426361581978071 1998 14.543854014562086 1999 11.06889420822219 2000 13.102418040597755 2001 6.913914005962212 2002 12.290431479329627 2003 5.53933744651502 2004 -1.9923719016308894 2005 12.18237925820371 2006 60.51428595222859 2007 2.7952518857007362 2008 11.66544132227223 2009 -4.87930996849984 2010 9.917161123419802 2011 8.833168224224707 2012 -0.5747194871837564 2013 3.5869353889672624 2014 5.4373926541278195 2015 -1.23111841681596 2016 2.5178459360124066 2017 7.69953503846061 2018 9.797605660695453 2019 1.0641428374179753 2020 1.6326212285270572 2021 11.914606437621899 2022 15.445402342483106 2023 -2.5150286792562326