Year annual % 1971 6.757852740970222 1972 6.823368967748095 1973 6.864274159360576 1974 6.82454151971406 1975 6.720362932577643 1976 6.649595047473952 1977 6.894270621304372 1978 7.248224622744971 1979 6.688184321086908 1980 6.155252895353257 1981 6.140685993759604 1982 8.11308950866379 1983 9.071212367907748 1984 3.795170689857869 1985 3.6601992108485035 1986 5.938281607660528 1987 3.342577883343182 1988 6.453705167773464 1989 9.892668729025786 1990 2.0494187846098697 1991 2.643071634798929 1992 7.34406692918725 1993 2.54643474492336 1994 -4.6649133413807675 1995 5.150414709270507 1996 12.69226345508639 1997 -1.3053523737627586 1998 2.7406467235295224 1999 6.1214526604288295 2000 14.453361698046592 2001 3.846153846153854 2002 4.830917874396135 2003 1.173020527859208 2004 5.736434108527135 2005 1.4948859166011204 2006 4.126984126984141 2007 -0.8333333333333286 2008 4.77941176470587 2009 1.05263157894737 2010 -0.568181818181813 2011 1.6413373860182219 2012 2.173913043478265 2013 0.8771929824561653 2014 7.5 2015 3.2031592803861315 2016 8.163265306122454 2017 2.96996222836934 2018 7.295593591149981 2019 6.438743850904487 2020 0.8908252443129925 2021 4.684765727116783 2022 5.547556479809273 2023 6.004098704876299