The promotion season (83/84) the capacity was 36,000 and the average was 29,881Season before Keegan took over it was 16,834
Promotion season with him was 21,148
First season with him in The Premier League 29,018
Our season in the 3rd tier we averaged 28,273
First season back (the following season 84/85) it was 26,228.
You have to consider everyone else's attendances at that time too before saying their crowds were shite.
City played Villa away on New Years Day in 1986 - four years after Villa won the European Cup. There were 14,000 there (including a few thousand from City).
I recall being at Stamford Bridge and there being 8000 there (i may be wrong but think 2 sides were closed because of hooliganism)