Australia also has significant emissions from animal agriculture and even without accounting for the underreporting, we emit far more methane than our population warrants. Mostly because of our export industries, but it does show we could have an outsized impact from moving away from these industries quickly.
But on the underreporting, this article suggests global methane emissions are 70% higher than reported, so it's probably broadly similar with Australia specifically (not that it makes it okay).
There's one on kbin but not very active yet.