user: Question: What is the percent for when against prohibition is 2978?
Columns: ['Jurisdiction', 'For Prohibition', 'Percent For', 'Against Prohibition', 'Percent Against']
Types: ['text', 'real', 'text', 'real', 'text']
Sample row: ['Alberta and Saskatchewan', 6238.0, '68.8', 2824.0, '31.2']
SQL:

assistant: SELECT "Percent For" FROM "Table" WHERE "Against Prohibition" = 2978.0;