It would be great to see that chart overplayed onto the price chart to see which one moves ahead (so to speak).
You can do this easily using https://bitinfocharts.com.Here's what the last 2 years looks like on a linear scale (click to go to site for full screen):
As you can see, there is no strong correlation. The hashrate started to climb along with the start of the big bull run back at the end of 2017. There was a dip in hashrate which corresponded to the dip in price from $6k to $3k at the end of last year. Beyond that, the hashrate has been on a fairly static upward trend regardless of what the price was doing.
If you zoom out to all data, and plot it on a log scale, it becomes a little more interesting:
Whether or not this apparent correlation means anything is highly dubious though. You can manipulate scales and time frames for two sets of data like this to prove almost anything you want.
