Question: Who was the leader at the summit for the race in 2005?
SQL: SELECT "Leader at the summit" FROM "2-12095103-1" WHERE "Year" = 2005.0;

Question: What is the sum of the stages for category 1 races after the year 2003?
SQL: SELECT SUM("Stage") FROM "2-12095103-1" WHERE "Category" = '1' AND "Year" > 2003.0;