user: Question: What is the sum of all the years that landon donovan won the ESPY award?
Columns: ['Year', 'Player', 'Nation of citizenship', 'Team represented', 'Position primarily played']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [2006.0, 'Landon Donovan', 'United States', 'Los Angeles Galaxy', 'Forward']
SQL:

assistant: SELECT SUM("Year") FROM "Table" WHERE "Player" = 'landon donovan';