2011 - 2013
This sparked off a very volatile year for bitcoin peaking at $1242 but also dropping very suddenly. It was basically a pump and dump scheme during this time.
the october(2013) jump in price
the october(2013) release of the first asics..
not a coincidence
when hobby GPU miners realise they cant profit from mining because asics takeover. 2 things happen
1. hobby GPU miners stop buying GPU and electric to get btc. and instead just buy btc.
2. asic miners realise the costs of mining increase so refuse to sell so cheap
then speculators see a jump and FOMO to over-jump the value. (value =moon fomospeculation=mars)