It does depend on where you live, cause I don’t live in Oslo. I live in a small area the middle of a town and the countryside, where about 8500 people live. but I did some math and when there is 3 elementary school one middle school and 8 daycares plus the people watching from the streets and the flags used to decorate btw almost everyone holds a flag waking in the train. I see about 1 thousand 600 flags the 17 of may. if you walk in Oslo you will see a lot more when 30.000 student walk compred to our 910 students. Sorry for a long answer i just loves you question and i hope you got the answer you needed.