I checked and it seems the one during Great Depression where it was 60% American was a different operation. Operation Wetback was 1954 and it says “some US citizens were deported” but doesn’t give numbers or percentages. For the Great Depression one it says

According to historian Francisco Balderrama, the U.S. deported over 1 million Mexican nationals, 60 percent of whom were U.S. citizens of Mexican descent, during the 1930s.