Year annual % growth 1961 18.543057822463865 1962 15.642410642989987 1963 -4.830913940572756 1964 13.705602364686214 1965 -11.607076220922607 1966 1.5151295635391904 1967 4.47761194012017 1968 -1.4285918129726838 1969 -5.313990079385334 1970 23.469409599758293 1971 1.6919680244028399 1972 -2.8454782431140444 1973 17.15483268236244 1974 -10.713506288621545 1975 -0.8009173094627045 1976 7.661294284248214 1977 4.495217582938054 1978 -7.7366564421312916 1979 -11.89529836480547 1980 -7.6862264208563715 1981 -21.781557151853846 1982 -11.156148557132724 1983 43.926470573655735 1984 4.279166249913715 1985 71.8238703794604 1986 0.26684528657270334 1987 -4.416828314028351 1988 5.590807105688668 1989 -1.9215591202449644 1990 -5.532544417842317 1991 -7.095588235542522 1992 -1.4785714281899658 1993 -4.255384620179257 1994 -10.993658608611838 1995 -2.0000088024293774 1996 -12.015518036003257 1997 11.842655789897208 1998 2.7738401045219234 1999 8.125793642987361 2000 6.791745671856759 2001 59.87133315747201 2002 148.33202583670172 2003 -40.705774525611204 2008 1.891300376944912 2009 22.152947948466718 2010 16.556028444491886 2011 -2.2422044123410814 2012 11.137308350721398 2013 -5.799999662856379 2014 9.10991042967379 2015 -21.80016027039315 2016 -10.400120805432465 2017 -1.2999985955450768 2018 1.4000022530094043 2019 3.9999978950395274 2020 1.799999797599952 2021 5.099997489936754 2022 2.0000024382352564 2023 15.999999996702854