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The given three pie charts illustrates the proportion of American online music service users by five age groups in the years 2013, 2015, 2017. All in all, in 2013, the proportion of 40-49 year olds was the largest, while in both 2015 and 2017, the largest age group became 30-39 and 20-29 year olds, respectively. In both 2013 and 2015, the proportion of 20-20 year olds was the smallest, while in 2017, over 50 olds became the smallest. Looking at the charts more closely, one can see that the proportion of 40-49 year olds was more than twice the figure of 20-29 year olds in 2013. Meanwhile, in 2015, 40-49 and 20-29 year olds were the same proportion at 26% each. Also, in 2017, the same proportion was seen at 24% between 10-19 and 30-39 year olds. Moreover, in the case of 40-49 year olds, the figure decreased gradually from 34% to 14% over the three years.
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