Year annual % growth 1966 0.9174830642644736 1967 2.5455193279901493 1968 -4.2553663733147715 1969 4.444495959853725 1970 -9.290894875481797 1971 1.5736160928433378 1972 1.9242215861004013 1973 10.714735400641203 1974 2.7283964950944153 1975 -2.747213099491745 1976 4.719644090674976 1977 2.4449113630656996 1978 2.7844023139277425 1979 2.8638417838627674 1980 -6.006531908026915 1981 3.4941037041309926 1982 7.4782211520549 1983 2.0275125183467253 1984 0.35831020853012774 1985 -1.6951185593308367 1986 0.1787325963803994 1987 -2.7279923386661125 1988 7.866173311140884 1989 -8.217715239722722 1990 8.480510722712125 1991 4.093147898199277 1992 0.1879987158373524 1993 2.425672187384521 1994 7.2775885471338455 1995 5.552498333877793 1996 -0.8900913140046356 1997 0.6089146749946224 1998 8.296077103073472 1999 2.3743494918424943 2000 -1.7658767352221787 2001 1.4911262243669796 2002 -2.650506663561515 2003 6.770418037659098 2004 0.3833247704482403 2005 18.788479449455124 2006 -0.5255508101776485 2007 8.537582928249904 2008 -2.1858213372872086 2009 -26.10145648069752 2010 39.52397781733828 2011 -2.4284831929182786 2012 -12.875153093327526 2013 11.476619617665108 2014 3.104253191467791 2015 7.541961722153843 2016 -4.716943352512729 2017 3.4450645817614856 2018 -14.58152224724435 2019 21.435393571125132 2020 -7.513449137475874 2021 1.8963432890351157 2022 -4.49057923368683 2023 -19.513884723922573