| Year | Value | | 2021 | 1,429.8129240876 | | 2020 | 1,395.9242105417 | | 2019 | 1,446.2062820519 | | 2018 | 1,280.3552460833 | | 2017 | 1,622.3836940247 | | 2016 | 2,317.0391188553 | | 2015 | 2,373.99408481 | | 2014 | 2,200.2575534235 | | 2013 | 1,968.6793844946 | | 2012 | 1,814.7241460567 | | 2011 | 1,637.7989720595 | | 2010 | 1,432.637428019 | | 2009 | 980.89227421292 | | 2008 | 826.86504387675 | | 2007 | 669.41469846789 | | 2006 | 482.34572751759 | | 2005 | 444.04611643054 | | 2004 | 365.39294449513 | | 2003 | 298.91547544056 | | 2002 | 292.10217423234 | | 2001 | 333.96000431717 | | 2000 | 449.63617755259 | | 1999 | 628.09534801409 | | 1998 | 563.88847478067 |
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