I don't think at the current point you could even define inflation rates for bitcoin. There's up to now no genuine bitcoin market of measurable size. Bitcoins are typically used as transaction medium, where the price is based on another currency, and as investment, where bitcoins are treated as asset instead of currency. Since inflation is defined as price growth (the price of goods sold in the currency, not the price of the currency in other currencies), and AFAICT virtually no goods are genuinely priced in bitcoins (what's the current price of butter in bitcoins, for example? Note that getting the price in dollars, and converting the value according to current exchange rates doesn't count), an inflation rate cannot be meaningfully defined.