I enjoyed this article in the NY Times about psychologists' research in procrastination at this link:
https://www.nytimes.com/2017/07/21/science/procrastination-research-conference.html?em_pos=large&emc=edit_sc_20170724&nl=science-times&nlid=74887997&ref=headline&te=1&_r=0
It seems they've concluded about 20% of people are 'true procrastinators'.
I'll get back to you later with my opinion on that one. :-)