The given line graph compares three different categories in terms of the proportion of total music sales by methot in a seven year period, starting from 2011.
Overall, it is clear that the indexes of all categories, except for streams, decreased significantly. Notably, the figure for streams became the highest at the end of the period.
Looking at the increasing figure, initially, the indicator of streams had a slow rise to 20% in 2015. In the following years, the index of the former had seen a noticable increase until the end of the period, showing just over 40%.
Looking at the decreasing indicators, in the frist year, the precentage of music sales by CDs purchased went down to 40%, while the opposite was true for that of downloads which showed just over 40% in 2013.
The index of the former was continued decreasing and showing at around 25% in 2018. The indicator of the latter increased to 43% before it had seen a slow decrease until last period showed 30%.