user: Question: When did the official rating 4+ reach 4 633 925?
Columns: ['Episode', 'Date', 'Official rating 4+', 'Share 4+', 'Official rating 16-39', 'Share 16-39']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, '7 March 2010', '4 577 667', '27,99%', '1 970 605', '25,68%']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Official rating 4+" = '4 633 925';