| Year | Value | | 2018 | 223.12978802063 | | 2017 | 180.57902303084 | | 2016 | 160.62943739509 | | 2015 | 147.59089104609 | | 2014 | 136.97696150854 | | 2013 | 124.68193517064 | | 2012 | 115.89984808065 | | 2011 | 108.48816751849 | | 2010 | 100 | | 2009 | 93.205393920094 | | 2008 | 86.761089851683 | | 2007 | 73.845856673749 | | 2006 | 66.293742071219 | | 2005 | 61.759687884297 | | 2004 | 55.722511075213 | | 2003 | 51.676697448044 | | 2002 | 46.838178642399 | | 2001 | 41.028664566234 |
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