Year % 1978 19.6056589060933 1979 108.47288158751626 1980 79.09675739735793 1981 133.9889469325135 1982 35.94431757502899 1983 24.84467038448327 1984 42.2603048091074 1985 61.59569812142181 1986 56.60973895658189 1987 97.16646547501959 1988 66.92447912481182 1989 45.52083727467534 1990 43.066824399765444 1991 29.941413919331026 1992 33.00699345861515 1993 37.793771764911625 1994 74.52222697687314 1995 37.36010661315306 1996 31.75013872049587 1997 32.02975167557475 1998 29.00268473510133 1999 18.194007443841855 2000 25.15756994884298 2001 30.224323154615245 2002 22.10224943081079 2003 20.966251315780973 2004 25.75009579551459 2005 26.940993078906867 2006 29.425463805973767 2007 36.949263306371456 2008 67.19359170319196 2009 37.60497319096522 2010 41.45867860861157 2011 45.31389649570807 2012 43.270417098907835 2013 45.61042657383882 2014 45.07466321736078 2015 46.362053370656895 2016 42.234455276544 2017 40.04737104259248 2018 49.65890355155697 2019 50.66972879423943 2020 76.50554217079522 2021 90.75638706545675 2022 83.34895655148085