Year | Value | 2022 | 10.971365290302 | 2021 | 5.6405114063675 | 2020 | 0.3497376967275 | 2019 | 1.1795433482181 | 2018 | 5.0320969198487 | 2017 | 7.5170628355112 | 2016 | 2.5781551524508 | 2015 | -1.0539983197128 | 2014 | 2.5108763325371 | 2013 | 0.77562932236742 | 2012 | 1.1475385370605 | 2011 | 6.2707530299569 | 2010 | 3.5349123918983 | 2009 | 1.4268597207053 | 2008 | 10.446987512822 | 2007 | 5.8422487490139 | 2006 | 6.1491160645658 | 2005 | 8.6656922113175 | 2004 | 10.973405367955 | 2003 | 11.638621958074 | 2002 | 10.359060791851 | 2001 | 8.2902831885033 | 2000 | 6.3276355141115 | 1999 | 4.4643546767589 | 1998 | 3.2744455426046 | 1997 | 2.1247313240804 | 1996 | 2.9952802399114 | 1995 | 1.4600063035097 | 1994 | 1.0129520669486 | 1993 | 0.96090446045917 | 1992 | 7.9369801219287 | 1991 | 10.595449399479 | 1990 | 9.7098638456266 | 1989 | 4.0736436479293 | 1988 | 9.924023398104 | 1987 | 4.685987787925 | 1986 | 21.673874876889 | 1985 | 16.765 | 1984 | 0.10645161290372 | 1983 | 9.8135531178778 | 1982 | 10.837870380065 | 1981 | 14.8992481203 | 1980 | 22.393388916497 | 1979 | 5.4600155279504 | 1978 | 9.5843791211129 | 1977 | 17.537938448461 | 1976 | 7.1095758354755 |
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