Year | Average price increment |
2001 | 81.8 |
2002 | 261.89 |
2003 | 26.19 |
2004 | 314.24 |
2005 | 678.11 |
2006 | 276.45 |
2007 | 1063.12 |
2008 | 197.69 |
2009 | 382.9 |
2010 | 918.58 |
2011 | 230.23 |
2012 | −64.98 |
2013 | 864 |
2014 | 965.55 |
2015 | 681.75 |