Here's some normalized data (pedestrian deaths to VMT) on Figure 5, page 12. Unfortunately it only goes back to 2016 and not 1975: https://www.ghsa.org/sites/default/files/2024-06/2023%20Pede...

And on page 10 of this NHTSA report (DOT HS 813 435), it shows that the proportion of nonoccupant fatalities have been increasing: https://crashstats.nhtsa.dot.gov/Api/Public/Publication/8134...