user: Question: What is the last year that Howard A. Wassum was in the 5th district?
Columns: ['Year', '1st District', '2nd District', '3rd District', '4th District', '5th District']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [1889.0, 'William H. Spurgeon', 'Jacob Ross, Jr.', 'Sheldon Littlefield', 'Samuel Armor', 'A. Guy Smith']
SQL:

assistant: SELECT MAX("Year") FROM "Table" WHERE "5th District" = 'Howard A. Wassum';