“The population motor-vehicle death rate reached its peak in 1937 with 30.8 deaths per 100,000 population. The current rate is 12.9 per 100,000, representing a 58% improvement.”
“In 1913, 33.38 people died for every 10,000 vehicles on the road. In 2020, the death rate was 1.53 per 10,000 vehicles, a 95% improvement.”
“In 1923, the first year miles driven was estimated, the motor-vehicle death rate was 18.65 deaths for every 100 million miles driven. Since 1923, the mileage death rate has decreased 92% and now stands at 1.46 deaths per 100 million miles driven.”
According to the graph on that site, the death rate per capita reached an all-time high in the early 1970s, and subsequently declined. There have been upward and downward blips since then but the death rate is still considerably below what it was in the early '70s.