Year annual % 1961 2.1830261556261377 1962 1.3809206042225242 1963 2.686899124292893 1964 2.8242852366138465 1965 2.994578299800324 1966 3.928524398612929 1967 2.6048964078520953 1968 2.3040629799891903 1969 2.7963683852335492 1970 3.8344570846062425 1971 5.38437111275978 1972 6.539215678603554 1973 14.500774830702198 1974 21.710622961532138 1975 10.944805241391691 1976 9.811214621352647 1977 10.576355851607616 1978 8.451851060513576 1979 14.453386844946522 1980 14.882020116728327 1981 9.978914387168466 1982 7.503304020555831 1983 8.25705979617679 1984 10.163689022414246 1985 6.851200072481866 1986 7.76430528268186 1987 11.012044645646156 1988 9.796055393620435 1989 8.99639074391456 1990 12.247747294764281 1991 13.622117597301504 1992 10.234748477289259 1993 10.999431052299371 1994 10.553151204648593 1995 9.58688163953974 1996 8.900004509533233 1997 7.279092977635202 1998 6.878110717352342 1999 6.888834101227431 2000 7.207762797170972 2001 6.012792433817381 2002 5.131939921545964 2003 5.759740766556746 2004 7.611524316085777 2005 6.814731428325246 2006 8.400938217403706 2007 7.115350543356385 2008 11.365091922974841 2009 4.873126919258382 2010 6.8992650940543 2011 8.060755175147662 2012 5.003235907948621 2013 4.337676095157889 2014 4.046710890858243 2015 3.072654403452873 2016 2.644245257504352 2017 4.1813750336502125 2018 3.8842402719391202 2019 3.061879454583277 2020 3.2174023324111403 2021 4.8471564324411816 2022 8.147826227981064 2023 4.544644675780653