CREATE TABLE table_73291 ("Expression" TEXT, "Y = 2008" TEXT, "Y = 2009" TEXT, "Y = 2010" TEXT, "Y = 2011" TEXT)

What is the y = 2008 when y = 2011 is a = 3?
SELECT "Y = 2008" FROM table_73291 WHERE "Y = 2011" = 'a = 3'
SELECT "Y = 2008" FROM "table_73291" WHERE "Y = 2011" = 'a = 3'