user: Question: Name the annual rainfail for 2002 population being 493984
Columns: ['Administrative Region', 'Population (2002 census data)', 'Surface km 2', 'Main Rivers', 'Average annual rainfall (mm)', 'Average annual runoff (mm)', 'Per capita average annual renewable water resources m 3']
Types: ['text', 'real', 'real', 'text', 'text', 'text', 'real']
Sample row: ['I - Tarapacá', 428594.0, 58698.0, 'Azapa River , Vítor River and Camarones River', '93.6', '7.1', 972.0]
SQL:

assistant: SELECT "Average annual rainfall (mm)" FROM "Table" WHERE "Population (2002 census data)" = 493984.0;