Year annual % 1977 8.298408864895677 1978 14.67956601350049 1979 20.802909271157063 1980 11.184846464319747 1981 17.17871742462951 1982 7.025943389084247 1983 -2.219738554694189 1984 4.29168776676552 1985 -2.7069471651415 1986 5.50463425067727 1987 2.323274370729237 1988 1.462169823033804 1989 -10.729219281299294 1990 -0.2759039061109263 1991 1.6085310670367363 1992 14.349776059688551 1993 4.486989779857552 1994 4.971476699647567 1995 6.200874443738186 1996 2.0870207816802804 1997 3.308475383047366 1998 3.012172690465647 1999 3.3895307940508843 2000 4.245711920791791 2001 5.269957575135706 2002 5.78380792679296 2003 4.161667555444069 2004 8.56721424236899 2005 8.146594810799314 2006 8.092975278119326 2007 8.176169952046465 2008 7.220386372801386 2009 5.023710072726686 2010 2.314834220630459 2011 2.7371798863210444 2012 2.4293580010023845 2013 2.609947375486314 2014 3.3840780993347153 2015 2.4965287931518816 2016 1.9941808493012019 2017 2.473598154490446 2018 1.9190726361085098 2019 1.7512390588061635 2020 -1.1027518830904626 2021 3.6556419103039843 2022 2.4280733046689846 2023 2.615487430213065