Interesting site and index's. I suspect that the increases, in each index, are driven by the older card's of the players and HoF's. The later years will see less appreciation than the earlier years of the examples. The HoF index appears driven by the 52 Mays, 53 Mantle, 54 Aaron, 55 Koufax, 63 Rose, and 68 Ryan. The large amount of rookie cards in the HoF index would naturally appreciate well though.
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