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| 1909 | $850 | $825 |
| 1910 | $950 | $900 |
| 1911 | $780 | $680 |
| 1912 | $690 | $590 |
| 1913 | $600 | $525 |
| 1914 | $490 | $440 |
| 1915 | $440 | $390 |
| 1916 | $360 | $345 |
| 1917 | $360 | $345 |
| 1918 | $525 | $500 |
| 1919 | $525 | $500 |
| 1920 March | $575 | $550 |
| 1920 September | $440 | $395 |
| 1921 June | $415 | $370 |
| 1921 September | $355 | $325 |
| 1922 | $348 | $319 |
| 1923 | $393 | $364 |
| 1924 | $295 | $265 |
| 1925 | $290 | $260 |
| 1926 | $380 | $360 |
| 1927 | $380 | $360 |
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