user: Question: What is the sum of the stages for category 1 races after the year 2003?
Columns: ['Year', 'Stage', 'Category', 'Start', 'Finish', 'Leader at the summit']
Types: ['real', 'real', 'text', 'text', 'text', 'text']
Sample row: [2013.0, 8.0, 'HC', 'Castres', 'Ax-3 Domaines', 'Nairo Quintana ( COL )']
SQL:

assistant: SELECT SUM("Stage") FROM "Table" WHERE "Category" = '1' AND "Year" > 2003.0;