It looks like it changed in 2011? The trend was already decidedly downward from 2000 to 2011, so it’s hard to say what if any impact raising the speed limit had. Xkcd 552
Yes - the interesting bit is that this downward trend was stronger than the effect of this legislation.
Truth be told a lot of this has to do with most fatalities being that of pedestrians. Personally I witnessed two such accidents, fortunately minor ones. Both times it was a pedestrian crossing on their green, but the car turning right also having green.
