Year annual % 1983 2.2828427853553483 1984 5.102470522178551 1985 10.915971062882582 1986 8.76999337735054 1987 9.6440893743427 1988 2.192642950896914 1989 16.532957894910176 1990 29.19090622628739 1991 29.387219381477124 1992 41.29100430701083 1993 17.686634450335017 1994 14.18370381667747 1995 20.889574323539563 1996 22.24155319979852 1997 19.722036464114005 1998 15.598741666833185 1999 15.67300080861395 2000 12.60713647478754 2001 16.35125364218404 2002 13.821367059137149 2003 10.952264835294537 2004 11.537496172286147 2005 14.700120770575406 2006 13.802586238336009 2007 11.01155109114654 2008 8.709683433674506 2009 3.648402842101256 2010 4.267200507400626 2011 6.666574298382312 2012 -4.636898067258803 2013 7.80915596675156 2014 2.4953699237276394 2015 5.6816452037505485 2016 7.238370669169863 2017 7.787365346134512 2018 11.815749776955276 2019 8.149967043663795 2020 21.090144211412866 2021 18.4989667582386 2022 8.45817898973613 2023 3.6540089901865387