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<p>[QUOTE=&quot;quarter-back, post: 1929129, member: 47022&quot;]Just for information regarding attrition rates.&nbsp; I used to roll search (2009-2010) and kept the pre-82 cents (a total of &gt;38,000).&nbsp; Since I am a statistics nut, I kept track of how many coins I found from each year from 1959 through 1982.&nbsp; I then calculated the expected number of each date I would expect to find based on their proportions relative to the total mintage for all years combined.&nbsp; There was a statistically significant difference between the expected values and the actual observed values. The crossover point was 1977.&nbsp; After 77, I found more than expected, before 77 I found less than expected.&nbsp; Not worth much, but might contribute to the attrition rate discussion.[/QUOTE]</p><p><br /></p>

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