user: Question: What is the sum of crowd(s) when Richmond is the away squad?
Columns: ['Home team', 'Home team score', 'Away team', 'Away team score', 'Venue', 'Crowd', 'Date']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['Hawthorn', '3.13 (31)', 'Richmond', '8.6 (54)', 'Glenferrie Oval', 13000.0, '14 July 1956']
SQL:

assistant: SELECT SUM("Crowd") FROM "Table" WHERE "Away team" = 'Richmond';