Don’t let facts get in the way of your argument….
In 2016, the global recorded music market grew by 5.9%, the fastest rate of growth since IFPI began tracking the market in 1997. This was a second consecutive year of global growth for the industry with revenue increasing in the vast majority of markets, including nine of the top ten. This growth, however, should be viewed in the context of the industry losing nearly 40% of its revenues in the preceding 15 years.
Streaming has been the clear driver of this growth, with revenues surging by 60.4%. With more than 100 million users of paid subscriptions globally, streaming has passed a crucial milestone. It makes up the majority of digital revenue, which, in turn, now accounts for 50% of total recorded music revenues.
http://www.ifpi.org/facts-and-stats.php
But this is about the amount being spent on music, not the amount going back into the pockets of the artists, which was the original argument. There may not be a direct correlation between the two.