You can equally ask what was inflation of natural gold and diamonds. It was zero since there is fixed amount of gold and diamonds on the planet. Same with bitcoin.

What?? There has been more Bitcoin today than there was yesterday since the first BTC was mined. It's the definition of inflationary. You have no idea what you are talking about.

In the same way as there are more gold dug from the ground today than before. What is the difference?