Year annual % 1971 6.366911598644286 1972 7.9468228672753085 1973 8.898405255992742 1974 14.152633504666667 1975 9.539803933384349 1976 8.140499411624063 1977 8.34326480627255 1978 7.309193238011879 1979 9.584882127182397 1980 12.668465525167917 1981 8.916964911262241 1982 8.11308950866379 1983 8.000000485904877 1984 4.815475836119717 1985 6.574924439590362 1986 5.09796961147002 1987 7.340010367563551 1988 7.32801561467528 1989 5.6928034371643434 1990 6.6794693688700875 1991 6.111373709714812 1992 7.34406692918725 1993 3.033732872686045 1994 2.6150313118472184 1995 1.7680839868646814 1996 2.9116655654236183 1997 3.1770227925516252 1998 3.413640750457006 1999 4.8283720267767904 2000 2.1789705814129263 2001 3.2453962100387628 2002 4.02298127208158 2003 2.547498200517026 2004 3.5751962041335332 2005 3.789038579301888 2006 3.872717159543896 2007 3.024456410386378 2008 5.468528592827269 2009 2.332361516034979 2010 0.958252850910597 2011 1.9512195121951237 2012 4.194069230618297 2013 0.8771929824561653 2014 3.0238942373196522 2015 3.2031592803861315 2016 2.6333266433458107 2017 2.5766856785920993 2018 3.99854350151341 2019 1.2413030324181875 2020 0.8908252443129925 2021 1.9831806200577375 2022 5.547556479809273 2023 6.318247469733819