| Month | Year | Condition | Price | |
 | Jul | 2006 | Very Good | $6.07 |
 | Aug | 2006 | Very Good | $5.97 |
 | Sep | 2006 | Very Good | $6.00 |
 | Oct | 2006 | Very Good | $6.03 |
 | Nov | 2006 | Very Good | $5.94 |
 | Dec | 2006 | Very Good | $5.90 |
 | Jan | 2007 | Very Good | $6.10 |
 | Feb | 2007 | Very Good | $5.98 |
 | Mar | 2007 | Very Good | $5.97 |
 | Apr | 2007 | Very Good | $6.11 |
 | May | 2007 | Very Good | $6.14 |
 | Jun | 2007 | Fine | $6.89 |
 | Jul | 2007 | Very Good | $6.00 |
 | Aug | 2007 | Very Good | $5.94 |
 | Oct | 2007 | Very Good | $6.14 |
 | Nov | 2007 | Very Good | $6.08 |
 | Jan | 2008 | Very Good | $5.99 |
 | Feb | 2008 | Very Good | $6.20 |
 | Mar | 2008 | Very Good | $6.08 |
 | May | 2008 | Fine | $7.24 |