I dont know exactly but I know sweden have More (not much More) tests than norway... and they have More Skier.. but that doesnt matter, its a norwegian skiier WHO has Been caught,With a story in lever With most other bad explainations from dopers. And her and her team mates behaviour just indicates something More. And i am not a norway-hater, i was a big fan of Johaug before this.
Found source here http://www.rf.se/globalassets/riksidrottsforbundet/dokument/antidoping/forskning-och-statistik/1607-antidopingstatistik-hemsida-skarp.pdf
389 tests on skiers last year and 191 off competition. This is the number of tests by the swedish anti doping organisation.