user: Question: What is the average 2007 value for a 2006 of 2.8 and 2009 under 20?
Columns: ['TV Station (Operator)', '2005', '2006', '2007', '2008', '2009', '2010', '2011 1H']
Types: ['text', 'real', 'real', 'real', 'real', 'real', 'real', 'real']
Sample row: ['BBTV CH7', 28.0, 27.4, 27.7, 31.0, 28.0, 31.0, 31.7]
SQL:

assistant: SELECT AVG("2007") FROM "Table" WHERE "2009" < 20.0 AND "2006" = 2.8;