Year % 1975 5.1538065091807 1976 6.39982933788432 1977 4.96664295206518 1978 0.48712164974921796 1979 4.3840252273732405 1980 5.38340806028599 1981 5.32321312427777 1982 4.84208574002438 1983 8.677158655891109 1984 7.632817074894491 1985 17.4230043724302 1986 17.9617419103806 1987 17.4302276952844 1988 19.836356168098302 1989 108.024754199373 1990 219.11815271801598 1991 31.717942051593102 1992 24.0892773054781 1993 25.1014363060796 1994 30.440735647786198 1995 42.4622452505672 1996 32.3939513576858 1997 32.7853349505677 1998 694.428462644894 1999 35.7726066266036 2000 32.2889225467526 2001 29.0175703797162 2002 19.3795485335246 2003 21.2938752654919 2004 29.5383820706895 2005 34.3189192173366 2006 43.0409641401728 2007 54.61455246111 2008 128.639287338754 2009 45.1538696941436 2010 38.750972372404604 2011 45.4885520640904 2012 22.293726761601 2013 22.544167695449598 2014 29.6716211216554 2015 33.0278463495497 2016 32.832315498144496 2017 26.2679759573687 2018 33.7596 2019 25.1543 2020 30.1171 2021 21.6376 2022 30.3899