1969-70 Topps 32.3%
1970-71 Topps 34.2%
1971-72 Topps 26.6%
1972-73 Topps 33.0%
1973-74 Topps 25.4%
1974-75 Topps 29.9%
1975-76 Topps 31.5%
1976-77 Topps 31.2%
1977-78 Topps 25.8%
1978-79 Topps 29.5%
1979-80 Topps 28.0%
1980-81 Topps (singles) 26.9%
1981-82 Topps 26.3%
From the trading card database.
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