Coindesk maintain a handy list of the legal and tax status of Bitcoin in various countries (although you have to scroll half way down the page as the first half is just about the US).  There are still plenty of countries like New Zealand that don't appear to have set any official guidelines on tax, but even so, they'll probably still class any profits you make as taxable. Unless a country has explicitly stated that it's exempt from tax, it's safer to declare it than not if you've made any profits. 

Aside from Denmark and Germany, the only other one that seems to come close is Singapore.  Singapore doesn't tax it if you're using it as an asset, but does tax it if you use it like a currency.