| Color | 1941 | 1960 | 1976 | 1987 | 1995 | 2002 | 2004 |
|---|---|---|---|---|---|---|---|
| Brown | 100% | ?% | 40% | 30% | 30% | ?% | 13% |
| Yellow | --- | ?% | 20% | 20% | 20% | ?% | 14% |
| Orange | --- | --- | 20% | 10% | 10% | ?% | 16% |
| Green | --- | ?% | 10% | 10% | 10% | ?% | 20% |
| Tan | --- | --- | 10% | 10% | --- | --- | --- |
| Red | --- | ?% | --- | 20% | 20% | ?% | 13% |
| Blue | --- | --- | --- | --- | 10% | ?% | 24% |
| Purple | --- | --- | --- | --- | --- | ?% | --- |
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