Year annual % 1961 3.278445997779599 1962 1.6674389844153268 1963 3.0139171557781737 1964 3.54797755518112 1965 2.9231537509407843 1966 4.120046535334836 1967 1.2803753506749374 1968 2.3676421396913554 1969 4.838560996096547 1970 3.859552080913687 1971 3.588168432693422 1972 5.553683675971314 1973 10.203841481163735 1974 14.160909161626563 1975 10.944805241391691 1976 10.291984951580943 1977 10.4461251876848 1978 9.159910193217343 1979 11.421245087751515 1980 12.740934927816937 1981 10.808507350147778 1982 11.59255375129132 1983 10.960140815036844 1984 11.86385524785144 1985 9.587877902025866 1986 8.024221996959753 1987 9.611629657822021 1988 9.15994114057903 1989 10.408283731300592 1990 10.610414719870512 1991 8.671014741171646 1992 7.2832831603953 1993 11.605429309027535 1994 23.831025219740525 1995 11.06400010587798 1996 9.998125319528476 1997 5.088057586172567 1998 6.947491092706159 1999 7.758437153618573 2000 8.844396247009577 2001 6.553990656449784 2002 3.8624345857023386 2003 5.814344133959814 2004 7.688401425345788 2005 7.562699744812349 2006 7.5567994224615305 2007 6.888389103197554 2008 9.750922988128906 2009 3.117229956299923 2010 5.644330860973355 2011 9.391655492037316 2012 5.308339371789074 2013 4.134331895049954 2014 2.6158966829377306 2015 2.9722893544020366 2016 4.781000290805508 2017 4.080784811961834 2018 4.215028414590563 2019 2.8560341198774495 2020 3.1716610674050685 2021 5.354275317635441 2022 8.642277522213249 2023 6.609305352586588