| 日期 | 单位：美元/小时 |
| 2009-07-24 | 7.25 |
| 2008-07-24 | 6.55 |
| 2007-07-24 | 5.85 |
| 1997-09-01 | 5.15 |
| 1996-10-01 | 4.75 |
| 1991-04-01 | 4.25 |
| 1990-04-01 | 3.80 |
| 1981-01-01 | 3.35 |
| 1980-01-01 | 3.10 |
| 1979-01-01 | 2.90 |
| 1978-01-01 | 2.65 |
| 1977-01-01 | 2.20 |
| 1976-01-01 | 2.00 |
| 1975-01-01 | 1.80 |
| 1974-05-01 | 1.60 |
| 1969-02-01 | 1.30 |
| 1968-02-01 | 1.15 |
| 1967-02-01 | 1.00 |
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