It was few times. And there was a more deep fall in percentages than now. So, be patient and wait for exponential growth.
it was roughly the same, we are closing in on the record
I use this historical graph :
https://99bitcoins.com/price-chart-history/as for the exponential growth, it is quite a long wait ahead , I am afraid
at the moment the market is going down and there seems to be no floor found, maybe 3000$ maybe 2000#, who knows
but if we compare the price to the last year's average of 1000$ there is nothing to complain about