Year annual % 1965 26.4447848490173 1966 13.2378854626539 1967 -8.42248589780283 1968 7.89473684210539 1969 7.31707316260125 1970 3.03030303053265 1971 9.55882353746772 1972 10.0671140939595 1973 17.6829268231711 1974 18.1347150268463 1975 29.8245614048168 1976 56.0810810829756 1977 116.450216453639 1978 73.091666667343 1979 54.4412883345616 1980 50.0701393436364 1981 116.503603996541 1982 22.2955664080893 1983 122.874514572592 1984 39.6653137947268 1985 10.3054406698295 1986 24.5654160765001 1987 39.8150678775363 1988 31.3592676264768 1989 25.2236920295825 1990 37.2590664855671 1991 18.0314390089849 1992 10.0561167448841 1993 24.9598424742497 1994 24.8702554369576 1995 59.4615536991446 1996 46.5610196762282 1997 27.8852086407527 1998 14.6241666666675 1999 4.86539785077528 2000 40.240933123914 2001 41.509496287803 2002 9.36093239560313 2003 29.7729797160384 2004 18.0427388232565 2005 15.4389920155908 2006 11.6791839392492 2007 10.7342665456292 2008 16.494639613412 2009 19.2469482220857 2010 10.7333898354915 2011 8.7284593709302 2012 11.1863409441067 2013 11.6661923071729 2014 15.4896160333318 2015 17.1499695007878 2016 17.4546347070868 2017 12.3719215507048 2018 7.80876516610703 2019 7.14364003330857 2020 9.88728956269944 2021 9.9710886750444 2022 31.2558951049016 2023 38.1069656296501