Chuck, stop posting that incredibly misleading chart. Bitcoin is 8 years old and having its 5th bubble already. So as a minimum its timeline should be 8 years and not 2, and it should show the earlier bubbles. (a 70-80% drop would classify as a bubble burst)
1. 2011 July top at $31 >> down to $2
2. 2013 April top at $266 >> down to $100
3. 2013 November top at $1242 >> down to $200
4. 2017 August top around $4687 (still going) >> ???
OK, here it is, the first bubble doesn't even show up, because of the later huge increase, but you can see it if you move your cursor over the chart: