Year | Value | 2021 | 17,262.586536424 | 2020 | 14,754.743492082 | 2019 | 16,155.113668195 | 2018 | 16,496.935844521 | 2017 | 15,546.665997477 | 2016 | 14,903.304933584 | 2015 | 15,044.374439371 | 2014 | 17,998.023521528 | 2013 | 17,844.248416658 | 2012 | 18,108.189414951 | 2011 | 20,268.839913797 | 2010 | 21,641.900358414 | 2009 | 24,419.489744675 | 2008 | 26,298.848835748 | 2007 | 23,908.784993216 | 2006 | 20,786.297020086 |
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