I'm probably being thick...
...but this doesn't seem to add up to me:
According to the Google commissioned report, between 2003 and 2019, the total advertising spend grew from €32.3bn to €112.2bn. During this period, the shares held by newspapers more than halved, falling to €10.8bn from €32.8bn.
If "total advertising spend" was €32.3bn in 2003, then the share "held by newspapers" cannot possibly have been €32.8bn.
I mean, even if those figures were reversed, I'd find it hard to believe that TV & radio (as the next biggest players) shared such a small proportion...
M.