Year annual % 1961 -2.0914020139426803 1962 10.759493670886076 1963 12.5 1964 -6.412698412698413 1965 32.808683853459975 1966 -15.488353085410708 1967 -2.2243713733075436 1968 25.927299703264094 1969 16.043200785468827 1970 22.273457991369828 1971 26.004221015119537 1972 26.458716603970455 1973 30.098794919118443 1974 41.766109785202865 1975 21.057898330625605 1976 3.4484435324665217 1977 17.96662749706228 1978 3.0146549044920987 1979 14.103040148526341 1980 11.922631033009946 1981 10.95180117150351 1982 12.132643980629698 1983 16.846974049369493 1984 24.046218207273576 1985 21.126566588624158 1986 60.43317295026276 1987 16.29986482608891 1988 44.17644776913576 1989 30.897132577690495 1990 38.04164290867164 1991 35.48132938456088 1992 26.897057343460684 1993 19.592203259227993 1994 11.448143588155526 1995 16.646798008951354 1996 17.130020358704233 1997 24.118912927919414 1998 17.723624839029696 1999 21.899448280300245 2000 16.798248521814287 2001 37.5664449845038 2002 5.4843812442902955 2003 87.1990375729933 2004 15.656402944871106 2005 7.437511466804729 2006 5.9623239159734105 2007 17.136471308727096 2008 5.411899481635897 2009 13.531374366896227 2010 12.33795208020112 2011 12.568690905942193 2012 9.95364367457718 2013 11.95057468935898 2014 9.26752299008154 2015 12.111315523658122 2016 9.752233798254046 2017 9.71039798869414 2018 6.636940292969265 2019 11.66885621779094 2020 21.750836379294253 2021 13.704209628402886 2022 5.568207159916699 2023 14.343722402192483