Year annual % 1961 -6.771653543307086 1962 33.823902027027025 1963 13.856324650120703 1964 10.184171505383794 1965 7.595271035089926 1966 15.119405253129786 1967 11.77760741647078 1968 30.13012967547067 1969 18.35595687275088 1970 15.109218469378426 1971 23.550118491001086 1972 12.912470165703468 1973 23.496603411831035 1974 33.04479076822413 1975 9.89970637316651 1976 5.727882120696512 1977 11.868940957826469 1978 17.021325993359973 1979 13.613751528404816 1980 31.708646877920533 1981 18.161216205001587 1982 36.65937461818562 1983 27.931038782094262 1984 13.720562230991447 1985 32.75941030385919 1986 47.563463469310605 1987 17.557129327832264 1988 38.5479564277287 1989 10.106188365366064 1990 21.601589761743977 1991 47.32024486638972 1992 54.40889983642136 1993 29.847657085072726 1994 28.58321682723526 1995 27.987170744360533 1996 22.394737611058925 1997 16.40170001972814 1998 8.481529684160256 1999 9.162127826326453 2000 -6.967078907976165 2001 26.22137998869032 2002 14.37118421752488 2003 11.005590124120864 2004 16.28649974952508 2005 7.2804284785455575 2006 15.476798085210714 2007 14.616282163115018 2008 5.15424837487751 2009 9.90714738696561 2010 5.584874922604613 2011 4.832576967726639 2012 8.699607417983321 2013 12.816398404542579 2014 6.74721431283641 2015 13.396968824083306 2016 13.431037295895646 2017 11.252447212635543 2018 9.891122285945272 2019 9.671376630657889 2020 18.47612300187115 2021 13.473413598538938 2022 8.521089118284717 2023 11.862872013260091