user: Question: Which date has an Opera usage percentage of 5.1% and Internet Explorer usage of 59.5%?
Columns: ['Date', 'Internet Explorer', 'Firefox', 'Opera', 'Safari', 'Source']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['June 2010', '53.8%', '30.6%', '2.4%', '6.8%', '2010-6']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Opera" = '5.1%' AND "Internet Explorer" = '59.5%';