| Year | Price | Year | Price |
| 2001 | 24.7137627909530 | 2012 | 112.0116726974720 |
| 2002 | 25.1150959752808 | 2013 | 108.9617254768180 |
| 2003 | 28.7791027197440 | 2014 | 99.3454458011795 |
| 2004 | 38.2335804473304 | 2015 | 53.0227124035385 |
| 2005 | 54.6838476064998 | 2016 | 45.0790762438045 |
| 2006 | 65.6047431065311 | 2017 | 54.8869160863291 |
| 2007 | 72.6528058457243 | 2018 | 71.6125929873267 |
| 2008 | 97.3301517582659 | 2019 | 64.1984739867620 |
| 2009 | 61.5810495718050 | 2020 | 43.3338428226363 |
| 2010 | 79.8070083443127 | 2021 | 70.8314995843529 |
| 2011 | 111.5392264335910 |
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