user: Question: How many winner's shares have Ai Miyazato as the champion?
Columns: ['Year', 'Dates', 'Champion', 'Country', 'Score', 'Margin of victory', 'Tournament Location', 'Purse ( US$ )', "Winner's share"]
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'text', 'real', 'real']
Sample row: [2013.0, 'Feb 28 – Mar 3', 'Stacy Lewis', 'United States', '273 (−15)', '1 stroke', 'Sentosa Golf Club', 1400000.0, 210000.0]
SQL:

assistant: SELECT COUNT("Winner's share") FROM "Table" WHERE "Champion" = 'Ai Miyazato';