Year annual % 1961 12.427745664739884 1962 3.020565552699229 1963 5.7392389270118525 1964 1.0029498525073746 1965 0.004672897196261682 1966 -5.753235830101397 1967 10.754967215756269 1968 12.355633645194503 1969 11.76983261368673 1970 10.778162957946048 1971 16.633750980431593 1972 31.591997765278357 1973 27.986036857664004 1974 19.539523797822937 1975 25.86298450807485 1976 38.163351130213 1977 19.86254749125038 1978 17.639125957714683 1979 9.982975506944973 1980 23.111657361357242 1981 12.214733729123383 1982 3.3127615250326095 1983 4.477455847372204 1984 13.675406630900328 1985 12.428359179299244 1986 9.204131490449512 1987 12.72938915827974 1988 -10.306421089394927 1989 37.607242650088395 1990 2.5196579914201727 1991 11.879239146714594 1992 30.465298628774697 1993 29.16049780852842 1994 31.449745778100603 1995 27.11235505901246 1996 1.1282446120706269 1997 20.137243558268466 1998 9.24490399270528 1999 23.6741584878933 2000 20.303230304823423 2001 15.396787124282238 2002 23.084063881929566 2003 38.89547070897673 2004 5.430207684418308 2005 17.8188303234953 2006 2.4427310385228163 2007 11.46714758060013 2008 12.845004426526604 2009 13.59201213796902 2010 26.115978997538758 2011 6.843090074171171 2012 7.165396329990369 2013 7.566116536995247 2014 7.739314891823761 2015 23.766097275723123 2016 19.11850703878283 2017 8.498230995191495 2018 19.156417606703933 2019 13.731626234866084 2020 4.223444376351924 2021 35.49315941106943 2022 31.522481918824006