Year annual % 1960 1.53661234295201 1961 2.077138331378615 1962 3.5198845401880647 1963 2.8740314034921903 1964 3.33462462892781 1965 3.66648280262594 1966 3.844656543498885 1967 3.63487515335757 1968 3.72079328019141 1969 3.27868852459016 1970 4.96831987329335 1971 6.13810741687984 1972 6.06300309718187 1973 8.09443961602797 1974 13.16360261207955 1975 11.687575365504099 1976 9.26775457576898 1977 9.29919719175366 1978 8.0832988258853 1979 9.04920959425409 1980 11.94997166261445 1981 11.7673874344181 1982 9.470989320524135 1983 7.31048579668418 1984 6.19476379545977 1985 4.77374272340097 1986 3.159097294519305 1987 4.066511159441105 1988 4.686201837530405 1989 5.7159915513563 1990 6.09844414810204 1991 5.62586408593005 1992 4.03703020778739 1993 4.14481954180488 1994 2.95340936761079 1995 3.75494413677554 1996 2.61538461538461 1997 2.20114313510882 1998 1.8343299990841 1999 1.611761176286595 2000 2.57987611218614 2001 2.656910939293155 2002 1.998749211493515 2003 2.02168542857986 2004 2.07924464636088 2005 2.3753195897788 2006 2.45792444195865 2007 2.32761128891476 2008 4.15279708110293 2009 0.839262246793887 2010 1.99621236745886 2011 3.3298532335065 2012 2.48567562177015 2013 1.423439482085295 2014 0.9414145400669625 2015 0.41004049800846754 2016 0.6250499230845115 2017 1.7626493189223802 2018 1.79471185151841 2019 1.62507725469196 2020 0.638544956776712 2021 2.51837109614213 2022 7.83269124233323 2023 5.09396758978883