The post you are reporting:
Voters.
Wilson 1974 (Feb): 11,645,616
Wilson 1974 (Oct): 11,457,079
Callaghan 1979: 11,532,218
Foot 1983: 8,456,934
Kinnock 1987: 10,029,807
Kinnock 1992: 11,560,484
Blair 1997: 13,518,167
Blair 2001: 10,724,953
Blair 2005: 9,552,436
Brown 2010: 8,609,527
Miliband 2015: 9,347,273
Corbyn 2017: 12,877,918
Corbyn 2019: 10,269,051
Average:
Corbyn: 11,573,485
Wilson: 11,551,348
Callaghan: 11,532,218
Blair: 11,265,185
Kinnock: 10,795,146
Miliband 2015: 9,347,273
Brown 2010: 8,609,527
Foot 1983: 8,456,934