user: Question: How many companies had an april 2013 cumulative ranking of 3?
Columns: ['April 2013 Cum. Rank', 'Name', 'Rank (all) 2012', 'Rank (all) 2013', '2013 Rank (oil companies)', '2013 rev (bil. USD )', '2013 Profit (mil. USD )', 'Assets (bil. USD )', 'Market cap March 15 (mil. USD )']
Types: ['real', 'text', 'real', 'real', 'text', 'text', 'real', 'text', 'real']
Sample row: [1.0, 'Suncor', 134.0, 142.0, '20 3', '38.8', 2800.0, '76.8', 47300.0]
SQL:

assistant: SELECT COUNT("Market cap March 15 (mil. USD )") FROM "Table" WHERE "April 2013 Cum. Rank" = 3.0;