user: Question: Which year had E34 Nimzo-Indian Defence is the opening?
Columns: ['White', 'Black', 'Year', 'Result', 'Moves', 'Tournament', 'Opening']
Types: ['text', 'text', 'real', 'text', 'real', 'text', 'text']
Sample row: ['Kramnik', 'Anand', 1994.0, '1–0', 60.0, 'Munich', 'B33 Sicilian Defence']
SQL:

assistant: SELECT "Year" FROM "Table" WHERE "Opening" = 'E34 Nimzo-Indian Defence';