| Year | Value | | 2021 | 8,403.730257305 | | 2020 | 6,771.2684884537 | | 2019 | 7,819.2833436108 | | 2018 | 7,781.8227980705 | | 2017 | 6,987.7836488776 | | 2016 | 6,136.763220385 | | 2015 | 5,857.0536126102 | | 2014 | 6,503.1862036066 | | 2013 | 6,410.1232065003 | | 2012 | 5,879.4042695633 | | 2011 | 6,550.512145006 | | 2010 | 5,836.8086906417 | | 2009 | 5,857.5271890639 | | 2008 | 6,625.9450827752 | | 2007 | 5,340.972056737 | | 2006 | 4,076.3893575158 |
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