user: Question: What year is the Happy Planet Index?
Columns: ['Index', 'Organization', 'Year', 'Rank', 'Out of']
Types: ['text', 'text', 'real', 'text', 'real']
Sample row: ['Happy Planet Index', 'New Economics Foundation', 2006.0, '84', 178.0]
SQL:

assistant: SELECT "Year" FROM "Table" WHERE "Index" = 'Happy Planet Index';