Year annual % 1971 9.753484413800066 1972 9.460457548456063 1973 9.633545072305978 1974 9.7777123927616 1975 9.897906645307302 1976 9.998140521584304 1977 8.000000495678876 1978 10.499999947917217 1979 10.499999946363928 1980 10.49999942620812 1981 10.50000042433608 1982 10.499999499748938 1983 8.000000485904877 1984 7.99999984199485 1985 8.0000001494178 1986 8.000000082463217 1987 7.9999997343327465 1988 8.000000138828739 1989 7.999999727775901 1990 8.000000332189813 1991 3.9616561859783275 1992 5.048878716002321 1993 4.975104205923017 1994 2.552247244724896 1995 2.8128208163958845 1996 2.9116655654236183 1997 2.2777694918093374 1998 1.595799407798168 1999 2.2528430761649787 2000 6.467943353173666 2001 0.12386692882009243 2002 -2.8584123926399627 2003 -1.818302131118557 2004 3.5751962041335332 2005 11.028080493772904 2006 1.502870411214758 2007 1.9417833328393925 2008 5.9522044511208065 2009 1.842087422292991 2010 -0.06454809355676616 2011 0.5401067831718933 2012 7.148987604179084 2013 7.195583346541241 2014 4.062200321572078 2015 6.500098009222739 2016 5.402461904909629 2017 -0.7631840816577693 2018 -2.0519515036754257 2019 -3.0789466149333578 2020 0.26076389818973666 2021 2.5303112564259322 2022 5.810828316435803 2023 8.052047038327316