Year annual % growth 1966 -0.8568396573730581 1967 -1.5058397552719498 1968 1.6740333261724203 1969 10.188761964851437 1970 15.216785354988005 1971 6.593832001823088 1972 14.089192013229805 1973 14.625088591619246 1974 3.608632327924184 1975 15.86484415186608 1976 3.801067422650675 1977 9.294451356659295 1978 5.657440578479054 1979 6.133955917548377 1980 12.795076948663734 1981 7.115558167003044 1982 2.47290829459304 1983 4.275672037015028 1984 5.7415407885855245 1985 2.133481947206022 1986 1.7126855379994623 1987 1.4940784789768458 1988 1.603609748355069 1989 -1.5268396991955626 1990 8.979905694329432 1991 1.2686982122282586 1992 6.8494865728885514 1993 3.2998952758199493 1994 3.0735599739403483 1995 3.017230462293938 1996 4.382270679358541 1997 4.502105594085421 1998 5.152000408651631 1999 5.793111297188631 2000 4.330791953571293 2001 10.814377164749885 2002 3.5028270937678343 2003 4.595312403859779 2004 5.178117233832495 2005 4.812301595957862 2006 4.462473767424996 2007 5.50008497550327 2008 4.802358202372176 2009 3.5767033829269224 2010 38.91039418530883 2011 4.141832699475884 2012 4.400436046511629 2013 3.000243639274643 2014 4.098942317439921 2015 3.2006751931441926 2016 2.91268243583292 2017 1.7436884895164724 2018 0.2853838412665084 2019 2.3140174038072843 2020 -2.0830893547253737 2021 2.351657223160757 2022 2.1734684934708213 2023 1.4467476769120822