 One of the first noticeable effects of the change in methodology was that there tended to be less turnover of the top songs.Before the switch, only one song had spent at least ten weeks at number one on the Hot 100 Airplay chart; from the period of December 1990 until the end of the decade, 16 songs had a minimum ten-week run at the top of the chart.While the BDS technology may have had some impact as to why this was happening, the cause has also been attributed to the trends of the radio industry at the time with stations playing the same songs over longer periods of time.