Year annual % 1961 2.502288189736518 1962 2.35127905147381 1963 2.686899124292893 1964 2.5474988709299993 1965 2.652404599714359 1966 3.20586501399589 1967 3.1462220056261927 1968 2.450480804461982 1969 3.8347824278768385 1970 4.5217522129127445 1971 5.922593680680343 1972 6.681292323175825 1973 14.758346008646171 1974 23.172937535320138 1975 10.714687806629918 1976 10.985861412095304 1977 10.512397302476941 1978 9.50919888329011 1979 15.088434074157796 1980 17.0107892918965 1981 8.460265310411927 1982 7.375667576885213 1983 7.13811504480536 1984 8.936292738581656 1985 7.062314258780781 1986 4.626291721385371 1987 9.490742515211629 1988 7.5564064420380745 1989 8.50493843632156 1990 11.415688998885322 1991 23.71325751258337 1992 14.08292063492864 1993 13.624424659552844 1994 20.616988811917707 1995 10.838319455778304 1996 10.247657332903557 1997 7.059671935016787 1998 5.6628447230408625 1999 6.888834101227431 2000 9.389713549040707 2001 6.119229850113996 2002 5.502324113069903 2003 5.623192590544562 2004 7.765278534605798 2005 7.026790842590074 2006 8.848192932659614 2007 7.063421716942344 2008 9.372730255634679 2009 2.288652044783504 2010 6.260416910567713 2011 6.866077816353069 2012 4.060109619635334 2013 2.662348759917201 2014 2.4499539343407832 2015 2.2255971962589953 2016 2.85015902860426 2017 3.7251727279074416 2018 3.383515709706984 2019 2.435056833369508 2020 1.4314158962752686 2021 6.05975657609514 2022 8.540518351847645 2023 4.524763557274468