| Year | Average sale price |
| 2000 | 1983.52 |
| 2001 | 2065.32 |
| 2002 | 2327.21 |
| 2003 | 2353.4 |
| 2004 | 2667.64 |
| 2005 | 3345.75 |
| 2006 | 3622.20 |
| 2007 | 4685.32 |
| 2008 | 4883.01 |
| 2009 | 5265.91 |
| 2010 | 6184.49 |
| 2011 | 6414.72 |
| 2012 | 6349.74 |
| 2013 | 7213.70 |
| 2014 | 8179.25 |
| 2015 | 8861.00 |