|---|---|---|
| 1960s | $8.50 | $75.22 |
| 1970s | $15.00 | $81.62 |
| 1980s | $25.00 | $69.28 |
| 1990s | $40.00 | $76.10 |
| 2000s | $50.00 | $68.80 |
| 2010s | $60.00 | $75.81 |
| 2020s | $70.00 | $84.31 |
*Inflation-adjusted prices calculated using the Consumer Price Index (CPI) from the Bureau of Labor Statistics.