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**This reduces the number of obs from 445,710 to just 59,205
*Requires the year to be >=1990 and <=2001
**142,738 out of 445,710(32%), or 18,055 out of 59,205
*Removes duplicates (should be redundant with revised data?)
*Removes markets with marketid NaN (not clear why this happens)

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