On the Filmoteca Espanola Tania Perez from the American Pilgrims on the Camino spotted a documentary on the Camino de Santiago.
Black and white
Visit several places starting in Roncesvalles,
see the empty roads...
Use the script to access specific places directly.
See the 15:26 minutes on this website.
Couldn't find statistics from 1955 that quick, but graph below shows some numbers for earlier 1970-ties.
Yes, it must have been different compared to today.