The current Dutch top 40 looks like this:
http://www.radio538.nl/top40.html (thursday 21 July)
Dutch Artists: 1, 5, 6, 7, 8, 9, 12, 16, 17, 23, 25, 31, 32, 37, 39 (15 of 40) (37,5%)
Non English/American/Dutch artists: 15, 18, 24, 26 (4 of 40) (10%)
Songs sung in Dutch: 1, 6, 7, 9, 25, 31 (6 out of 40) (15%)
unknown : 27 (probably Dutch)
It's all crap though, but I don't think that's very different in any other country.