| Year | Value | | 2014 | -102.66273733046 | | 2013 | -103.5453686184 | | 2012 | -106.86218801158 | | 2011 | -104.81811710129 | | 2010 | -112.02977876773 | | 2009 | -121.22439860079 | | 2008 | -120.20968418128 | | 2007 | -115.85667293555 | | 2006 | -125.69511116529 | | 2005 | -116.66297369635 | | 2004 | -129.46908888219 | | 2003 | -125.40678564759 | | 2002 | -92.654202507446 | | 2001 | -79.005106674826 | | 2000 | -93.493035998806 | | 1999 | -73.198252770313 | | 1998 | -74.483495836459 | | 1997 | -87.809702409119 | | 1996 | -77.619789626996 | | 1995 | -98.249581055666 | | 1994 | -95.134695116877 | | 1993 | -85.120178461957 | | 1992 | -89.127759639458 | | 1991 | -105.80312249606 | | 1990 | -110.93202331996 | | 1989 | -131.62991218414 | | 1988 | -126.62878697535 | | 1987 | -140.23011120257 | | 1986 | -136.01777390553 | | 1985 | -152.08991379012 | | 1984 | -158.94292011774 | | 1983 | -170.17304178689 | | 1982 | -198.25125758434 | | 1981 | -200.99681694702 | | 1980 | -243.70694963256 | | 1979 | -256.99278684482 | | 1978 | -289.60350278212 | | 1977 | -355.7970669566 | | 1976 | -374.4540076937 | | 1975 | -425.67448404324 | | 1974 | -307.06340912617 | | 1973 | -278.21144767773 | | 1972 | -226.40007773039 | | 1971 | -209.61392051831 |
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