Year annual % 1961 1.933946526073882 1962 0.5966071827002963 1963 3.150052774338107 1964 3.7269776231950473 1965 2.962826112493012 1966 3.4445181118189865 1967 1.7793841485914257 1968 3.2270942578252217 1969 4.6606928372715615 1970 4.937523593030704 1971 3.279353071142282 1972 9.814576034843995 1973 12.22447490291269 1974 15.128346129364814 1975 11.884430878028155 1976 9.530632469395748 1977 10.40810118196466 1978 10.540289734601792 1979 14.571237401444044 1980 19.205294758314253 1981 10.858488369680742 1982 7.697471775970726 1983 11.556841727952076 1984 12.734755763856057 1985 16.14433126055718 1986 13.916576908552855 1987 12.694069823943323 1988 20.152601263973537 1989 14.839283909724628 1990 11.993903907882881 1991 14.978936424738663 1992 14.640655210188406 1993 13.87050259376808 1994 17.01641478725419 1995 16.102711742496226 1996 15.176180335890493 1997 10.54504865514589 1998 9.109172939018066 1999 8.006813296561788 2000 11.11730588248625 2001 8.312824999512983 2002 8.914928256750045 2003 7.806740872975098 2004 9.60039256006742 2005 7.623689358782684 2006 7.652254305265288 2007 8.245764766116736 2008 10.961412407555954 2009 8.28143239119239 2010 5.883022034869526 2011 9.745709985237717 2012 6.2038885361032 2013 6.188554825731863 2014 5.403535372655639 2015 5.54529642817306 2016 7.00282332300992 2017 5.217430865415096 2018 4.321756525949887 2019 4.444379464941157 2020 5.089640709148355 2021 5.535521294052103 2022 8.562984704173665 2023 8.770822560219209