Year annual % 1961 4.237918215613383 1962 7.346647646219687 1963 11.428571428571429 1964 14.609421586165771 1965 8.168574401664932 1966 11.736411736411737 1967 12.139474817046922 1968 7.754318618042226 1969 12.255076594228715 1970 11.107584893684544 1971 11.168237646386746 1972 24.100719424460433 1973 22.422360248447205 1974 14.053779807204464 1975 22.627520759193356 1976 30.82224909310762 1977 18.735557814955172 1978 13.731900980850071 1979 7.32375085557837 1980 10.612244897959183 1981 12.223247232472325 1982 15.176736539251953 1983 -1.3471317691141047 1984 11.5527220112136 1985 32.803696647886184 1986 20.736173849346844 1987 8.329541432832803 1988 19.725573472102305 1989 16.337270494678986 1990 22.151856319528214 1991 48.53243725140584 1992 20.619603859827322 1993 6.28133971291866 1994 3.8255420298206437 1995 15.55698933682991 1996 5.7256926725302435 1997 25.362006110095287 1998 19.47636627182751 1999 8.707471129275635 2000 21.446034408797157 2001 36.88537414377077 2002 8.29013825870172 2003 45.14745196446887 2004 10.810609999531549 2005 13.71925419021023 2006 12.993920434554013 2007 10.285748362854914 2008 8.517287480232664 2009 11.34566929828501 2010 9.064348471782848 2011 7.234983046952959 2012 9.36068286662642 2013 9.546575492013751 2014 7.874714651390495 2015 9.090033405122215 2016 6.349587715059417 2017 7.303292681700745 2018 9.650642884731699 2019 8.750106332270267 2020 18.065848346590275 2021 8.024316610313678 2022 7.008374832993016 2023 6.059394599724894