Energy sector's worst-ever loss

Crude oil futures only go back about 35 years, so there’s really no precedent for the kind of action that just triggered. Even 1991 didn’t see this kind of damage, at least on such a compressed time frame and with oil being the cheapest it’s been in years. 

We can get a little better sense of history looking at energy companies. And those suffered a massively ugly day as well.

See this report for more detail.