Year annual % growth 1966 14.45778529556307 1967 -4.210776061161667 1968 4.395876579864819 1969 0 1970 15.790002026952038 1971 22.72688481424882 1972 13.333486431571544 1973 -6.535830296121119 1974 6.293330541518131 1975 28.947536373969882 1976 13.26529733414749 1977 12.162020180671277 1978 3.3225610067439675 1979 8.83399523530963 1980 1.071358710813584 1981 -13.50649094756055 1982 -2.402402330747833 1983 -14.461538949142778 1984 7.913670774437946 1985 -18.666700134933635 1986 36.906174160933006 1987 -1.858117151656586 1988 -17.612222983425767 1989 12.88422002284915 1990 5.618962741746955 1991 -1.5665109613570536 1992 -17.61132334196381 1993 8.800004055989334 1994 -6.900000385203967 1995 0.09999950385169143 1996 -4.012439987598128 1997 -5.699997899899344 1998 38.079117073269316 1999 -7.085061143198075 2000 0.11061264849358565 2001 17.44516349338636 2002 -14.80050263146228 2003 2.968681671730522 2004 -1.412074886488739 2005 17.39524539244472 2006 7.826934586554614 2007 -11.801570306020224 2008 19.837185624052765 2009 9.57653345635596 2010 11.952635733707552 2011 0.009088259535445786 2012 2.8534541648650844 2013 13.874501870650846 2014 2.493792941075796 2015 15.719845779962256 2016 2.302822146817803 2017 -6.906953354758784 2018 -1.5599036194193872 2019 4.0617812672920905 2020 1.8350298053005645 2021 0.22101427568814813 2022 7.2217586443188395 2023 2.557023487846479