As more countries join to this idea and use btc as legal tender, circulation will be much more and more demanded accordingly!
That's wrong; this thread is about
how many BTC are in circulation. They
may 'circulate more' if it becomes legal tender in more countries, but it doesn't change the amount of Bitcoin in circulation. Only mining and halvings affect the rate at which more Bitcoin enter circulation, and only real burning of BTC removes them from circulation, in my opinion.