A significant fall in those killed in Islamist terror attacks
The 2018 figures are based on the first three months multiplied by four.
While the death toll is still in the thousands, it is significant that in 2014 over 30,000 were killed and so far in 2018 under 3,000 have died. There’s been a strong downwards trend for four years.
I suspect most (but not all) of this is related to the defeats the Islamic State has suffered.