The data displays the 3 dissimilar categories of music sales from 2011 to 2018 Streams, Downloads and CD purchased.
The evidence suggests that Steams steady increase in the duration for 7 years and in the beginning it was about 5% but then increased to about 40%. In addition, it was one of the unprofitable one in early period but then become most popular method. Downloads have been fluctuated in the whole interval, firstly rose and then fall. CDs purchased trend is the opposite to Streams, it is steady decrease and was most profitable from 2011 to 2013 and started from about 55% to about 25%. At the first half of the period the trend of the Downloads and Streams were grow in similar temps without significant rises, however, both increase steady. At the second half CDs and Downloads decreased slightly but trend of Streams remains the same.
Taking the above into consideration, this illustration demonstrates sales of 3 group of methods. Streams steady increase, but Downloads fluctuated and CD steady decreases.