Our average league attendances for years 1904; 1920, 1939, 1959, 1979, 1999 and 2018. Data taken from https://www.european-football-statistics.co.uk/englandcontent.htm
1904: 19,870 (2nd highest). Year of our first trophy.
1920: 25,160 (11th)
1939: 31,291 (6th)
1959: 32,568 (10th)
1979: 36,210...