> At the 1999 peak ... according to the music trade group International Federation for the Phonographic Industry, across the total 18-and-over population (both across many countries or individually within one), the average amount spent came to $28 per consumer.
Moving on:
> But that includes people who did not buy any music that year. If we look at just the consumers who bought music, they spent $64 on average that year.
> Another study by NPD Group in 2011 found similar spending, about $55 per music buyer per year on all forms of recorded music
Note, that's all forms of music.
> about $12 per iTunes account per quarter is spent on music, or about $48 per year.
Cherry picking from the article from 2014:
> At the 1999 peak ... according to the music trade group International Federation for the Phonographic Industry, across the total 18-and-over population (both across many countries or individually within one), the average amount spent came to $28 per consumer.
Moving on:
> But that includes people who did not buy any music that year. If we look at just the consumers who bought music, they spent $64 on average that year.
> Another study by NPD Group in 2011 found similar spending, about $55 per music buyer per year on all forms of recorded music
Note, that's all forms of music.
> about $12 per iTunes account per quarter is spent on music, or about $48 per year.