| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Average Price | ||
| 2005 | $1,338 | $1,331 | $1,474 | $1,381 | ||||||||||
| 2006 | $1,399 | $1,240 | $1,211 | $1,314 | $1,271 | $1,258 | $1,249 | $1,275 | $1,294 | $1,881 | $1,254 | $1,263 | $1,326 | |
| 2007 | $1,295 | $1,310 | $1,453 | $1,537 | $2,204 | $1,434 | $1,546 | $1,578 | $1,603 | $1,511 | $1,493 | $1,531 | $1,541 | |
| 2008 | $1,511 | $2,788 | $1,342 | $1,467 | $1,777 | |||||||||
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Median Price | ||
| 2005 | $1,200 | $1,200 | $1,200 | $1,200 | ||||||||||
| 2006 | $ 1,150 | $ 1,175 | $ 1,150 | $ 1,195 | $ 1,195 | $ 1,195 | $ 1,200 | $ 1,200 | $ 1,200 | $ 1,200 | $ 1,195 | $ 1,195 | $1,195 | |
| 2007 | $ 1,200 | $ 1,200 | $ 1,200 | $ 1,295 | $ 1,295 | $ 1,250 | $ 1,297 | $ 1,295 | $ 1,295 | $ 1,295 | $ 1,200 | $ 1,295 | $1,295 | |
| 2008 | $ 1,200 | $ 1,200 | $ 1,200 | $ 1,250 | $1,200 | |||||||||
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