| Month | Year | Condition | Price | |
 | Feb | 1980 | Very Good | $5.13 |
 | Mar | 1980 | Good | $32.63 |
 | Apr | 1980 | Good | $3.10 |
 | May | 1980 | Very Good | $5.08 |
 | May | 1980 | Very Good | $5.08 |
 | Jun | 1980 | Good | $3.11 |
 | Jun | 1980 | Very Good | $5.21 |
 | Jun | 1980 | Very Good | $5.21 |
 | Jun | 1980 | Very Good | $5.21 |
 | Jul | 1980 | Very Good | $5.19 |
 | Jul | 1980 | Very Good | $5.19 |
 | Jul | 1980 | Very Good | $5.19 |
 | Jul | 1980 | Very Good | $5.19 |
 | Aug | 1980 | Good | $3.09 |
 | Aug | 1980 | Fair | $2.02 |
 | Sep | 1980 | Very Good | $5.02 |
 | Sep | 1980 | Good | $3.09 |
 | Oct | 1980 | Very Good | $5.06 |
 | Oct | 1980 | Very Good | $5.06 |
 | Nov | 1980 | Very Good | $5.08 |