Year | Value | 2021 | 1,362.7702568634 | 2020 | 1,271.914322633 | 2019 | 1,255.1115443671 | 2018 | 1,295.2596399213 | 2017 | 1,199.9308191806 | 2016 | 1,162.6784092147 | 2015 | 1,135.3037116001 | 2014 | 1,310.4372588138 | 2013 | 1,226.349435127 | 2012 | 1,110.1245942618 | 2011 | 1,169.5208525506 | 2010 | 1,097.6429758145 | 2009 | 1,177.6645892308 | 2008 | 1,149.3270288303 | 2007 | 1,039.3324911926 | 2006 | 950.74925638495 | 2005 | 909.74251639073 | 2004 | 931.89700756114 | 2003 | 798.14293248034 | 2002 | 620.87918800657 | 2001 | 556.30970402389 | 2000 | 541.84534215051 | 1999 | 642.24841336215 | 1998 | 637.20315508169 | 1997 | 594.46274970811 | 1996 | 627.27114649866 | 1995 | 633.6680011569 | 1994 | 534.93125711904 | 1993 | 1,059.2551252634 | 1992 | 775.29223570297 | 1991 | 777.5138569147 | 1990 | 823.93547815703 | 1989 | 805.04173951292 | 1988 | 994.11875118012 | 1987 | 1,077.4257456918 | 1986 | 1,050.186499385 | 1985 | 712.67524171825 | 1984 | 631.79805420731 | 1983 | 602.49357563572 | 1982 | 594.46217867618 | 1981 | 558.0096512226 | 1980 | 518.0922511716 | 1979 | 566.75100616954 | 1978 | 462.15297133328 | 1977 | 276.8592440231 | 1976 | 289.62936660956 | 1975 | 293.17902094099 | 1974 | 221.83122894642 | 1973 | 203.33611262909 | 1972 | 182.506189836 | 1971 | 154.80731909588 |
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