Year annual % 1962 18.48137535816619 1963 6.6505441354292625 1964 14.625850340136054 1965 -8.555885262116716 1966 2.43374797187669 1967 1.5311510031678985 1968 13.260530421216849 1969 11.248852157943066 1970 10.647957078002475 1971 28.869824692279 1972 12.243125904486252 1973 25.786487880350695 1974 18.20418204182042 1975 8.914325355532432 1976 21.59235668789809 1977 21.581980094290206 1978 11.28823782852219 1979 43.07007355787844 1980 32.57340008117981 1981 67.23478083380108 1982 35.19970707594666 1983 -12.245819133810286 1984 11.897230151994446 1985 20.434852559240614 1986 20.515267175572518 1987 27.711797307996832 1988 7.774333539987601 1989 16.716520938794293 1990 19.25086249383933 1991 -1.8763431972226814 1992 0.7160306629601549 1993 1.4386082301773169 1994 13.852242744063325 1995 24.355446118192354 1996 6.283850678469513 1997 15.15068493150685 1998 2.4839400428265526 1999 15.726424293077029 2000 16.325629914941423 2001 6.101472769289138 2002 10.213900266562643 2003 13.960004719207172 2004 8.321039418174289 2005 15.64799770620281 2006 13.750748951467944 2007 11.006874755932541 2008 7.370186447195111 2009 8.918957222470281 2010 6.4135568937341905 2011 -6.133772298889263 2012 -1.643732386080311 2013 6.39286573842655 2014 9.616252096498497 2015 6.043691691496117 2016 9.157739462675018 2017 15.20644766546406 2018 8.758909538425474 2019 4.6409029562792625 2020 5.393747510791599 2021 1.6898622950419193 2022 7.332785831246167 2023 13.677195353193264