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| year | number | 1925 | 1 |
| 1930 | 10,000 |
| 1935 | 30,000 |
| 1940 | 40,000 |
| 1945 | 45,000 |
| 1950 | 50,000 |
| 1955 | 65,000 |
| 1960 | 100,000 |
| 1965 | 160,000 |
| 1970 | 420,000 |
| 1975 | 600,000 |
Source:
Allied Supply