Year annual % 1971 5.38437111275978 1972 6.823368967748095 1973 12.548073998237058 1974 18.08781729339661 1975 9.758262632622817 1976 6.649595047473952 1977 8.57940941126563 1978 7.370161853278788 1979 10.625525795503961 1980 12.861005655878913 1981 8.872499193891038 1982 7.436987913116482 1983 5.66428865895918 1984 6.177908566006948 1985 4.450868453416319 1986 5.09796961147002 1987 6.962385149490217 1988 6.453705167773464 1989 5.68893659993266 1990 6.37017751588742 1991 5.993131638201959 1992 5.048878716002321 1993 3.0283126877492634 1994 3.561744069450185 1995 2.872997532200671 1996 3.198700339136451 1997 2.530620585584728 1998 2.970092815272068 1999 4.433423515799291 2000 2.7434059904078794 2001 3.6249055294183705 2002 3.266447482537899 2003 3.8886139103935875 2004 3.762837175502213 2005 3.9480996996314133 2006 4.126984126984141 2007 4.688177919465957 2008 5.60618091108023 2009 1.7651258761991073 2010 1.8223523042534566 2011 2.7869098819282954 2012 3.440880300341618 2013 2.1245418386185406 2014 1.375841495260353 2015 2.7732812185904834 2016 1.8560021624687053 2017 2.1735199144140296 2018 1.9499820216754884 2019 1.7843488858360246 2020 0.3026703306639007 2021 2.9081414658777973 2022 5.810828316435803 2023 4.735828043271326