At 27%, deaths due to rollovers in 1978 = 13,589 deaths
At 29%, deaths due to rollovers in 2018 = 10,602 deaths.
So, there were 3,000 fewer deaths, in a time when there are over twice as many miles driven per year (1.5T per year in 1978 vs 3.2T per year in 2018).
And, assuming the 70% figure holds true for 2018, that…