user: Question: How many years were lightweight class on february 28, 2009?
Columns: ['Year', 'Date', 'Location', 'Winner', 'Loser', 'Weight class']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [2002.0, 'May 18, 2002', 'Uncasville, Connecticut , United States', 'Micky Ward United States', 'Arturo Gatti Canada', 'Welterweight']
SQL:

assistant: SELECT COUNT("Year") FROM "Table" WHERE "Weight class" = 'lightweight' AND "Date" = 'february 28, 2009';