How This Chart Was Created
The ranking is based on actual performance on the weekly Billboard Hot 100. Songs are ranked based on an inverse point system, with weeks at No. 1 earning the greatest value and weeks at No. 100 earning the least. Prior to the Hot 100's implementation in 1991 of enhanced radio and sales information from Nielsen BDS and Nielsen SoundScan, songs had shorter reigns at No. 1 and shorter chart lives. To ensure equitable representation, earlier time frames were each weighted to account for the difference between turnover rates from those decades and the turnover rates that have occurred since the advent of Nielsen Music data.
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