| Year | Value | | 2021 | 676.506604 | | 2020 | 572.07627 | | 2019 | 1,022.84225 | | 2018 | 762.66195 | | 2017 | 453.34954 | | 2016 | 451.25618 | | 2015 | 384.47024 | | 2014 | 450.22003789915 | | 2013 | 497.17982029342 | | 2012 | 503.55032272095 | | 2011 | 475.3856595746 | | 2010 | 426.91573 | | 2009 | 311.502 | | 2008 | 295.759 | | 2007 | 258.488 | | 2006 | 216.012 | | 2005 | 230.186 | | 2004 | 216.527 | | 2003 | 164.459 | | 2002 | 151.91 | | 2001 | 135.363 | | 2000 | 117.332 | | 1999 | 98.5 | | 1998 | 95.5999984741 | | 1997 | 103.5999984741 | | 1996 | 82.9000015259 | | 1975 | 0.8999999762 | | 1974 | 3 | | 1973 | 3.5 | | 1972 | 3.4000000954 | | 1971 | 3.4000000954 | | 1970 | 4.5999999046 |
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