For reasons that aren't clear, Bitcoin follows the law of compound interest if you only look at long term minimum exchange rates to the US dollar.
The interest rate has been approximately 185% since 2012. More precisely, take the price at October 29th, 2012, multiply it by every days, and you will have the current expected minimum exchange rate.
We are about 69% above the minimum price right now, which is nothing compared to the 2017 bubble.