Year annual % 1961 4.760296184196303 1962 7.919412880009287 1963 10.458820857883854 1964 11.585986020644436 1965 5.160477067778532 1966 7.756426806329067 1967 9.006195235487406 1968 7.034359324588466 1969 9.526952695269527 1970 5.115843042721306 1971 8.711300802650019 1972 19.6812282089596 1973 21.306587283712457 1974 9.158093146969435 1975 20.559144237915465 1976 12.228761758129863 1977 5.920917788715112 1978 10.49023579100542 1979 11.609394556425249 1980 14.014833722134465 1981 9.884558428188956 1982 10.595223582496823 1983 13.235527275417772 1984 11.735165358299652 1985 17.914696015495494 1986 9.563253012048193 1987 16.028341277759303 1988 17.914381025930908 1989 31.016042780748666 1990 12.7576788291074 1991 1.1821723531159305 1992 7.379035958798623 1993 5.726582262144198 1994 9.959255750627609 1995 8.518371715137107 1996 10.648952222168544 1997 7.310580376614016 1998 8.430357789896435 1999 11.704258098880285 2000 3.7399095746764823 2001 10.93057635606067 2002 7.035917117418039 2003 12.763434948730412 2004 11.418295397068047 2005 8.500854209656735 2006 15.063194701950922 2007 18.232985800276307 2008 17.004743830431003 2009 3.2075215817785074 2010 10.13077680427148 2011 7.967777687957106 2012 7.347916752100823 2013 6.747131991611393 2014 7.0328976999105866 2015 5.984082434644003 2016 6.666188127343009 2017 4.521987656431494 2018 2.37382234106626 2019 14.059533186953722 2020 13.668232516086846 2021 6.699811052591947 2022 7.841017065458754 2023 3.933206869721394