For instance in the EU: https://en.m.wikipedia.org/wiki/Terrorism_in_the_European_Un... The number of attacks and number of victims has been pretty much consistent since the 50s with a small spike with the Madrid bombings.
What has changed is our sensitivity to terrorism which has become absurdly high. There are violent crimes happening every day which kill an order of magnitude more people. Gang violence alone in the US kills several 9/11 every year. There are thousands of knife attacks just in London every year. None of that even make it to the news anymore.
And the number of deaths linked to terrorism (1,100 in Europe since the 50s according to that wiki article) is dwarfed by things like death due to accidental drowning (35,000 every year according to eurostat).
It is useful to remember this when we see politicians in pretty much every western countries throwing out of the window basic civil liberties in the name of the war on terror. The budget spent on anti-terrorism should be better spent teaching people to swim.