Year annual % 1981 9.97237569060774 1982 9.84677216779704 1983 18.0577787941154 1984 7.03770661157025 1985 1.88201230546507 1986 9.96447602131433 1987 6.33177192699085 1988 10.0967137576586 1989 8.77983718898032 1990 10.0118383223406 1991 12.2751729438893 1992 15.975217361539 1993 11.1980165874679 1994 7.00995355009951 1995 9.48754836789367 1996 8.79001381935165 1997 6.5054871826909 1998 10.5855899892462 1999 6.77699393553632 2000 4.01212081070342 2001 3.41478946111596 2002 2.45535714285716 2003 2.57230861693335 2004 4.10593698272959 2005 5.31263104637751 2006 5.00045438022541 2007 5.15611138758463 2008 8.32716049382714 2009 4.36112219119802 2010 7.0363831607302 2011 8.848985699468 2012 10.919656944683 2013 8.77638345268213 2014 8.27106093949328 2015 4.54814395082205 2016 3.21988689395718 2017 4.95508366985129 2018 2.7239638618372 2019 2.7264303738882 2020 5.62936522632514 2021 7.3468144053353 2022 5.63916671396365 2023 4.22934419929261