CREATE TABLE table_62607 ("Year" FLOAT, "Network" TEXT, "Play-by-play" TEXT, "Colour commentator ( s ) " TEXT, "Pregame host" TEXT)

For which network was Chris Walby the color commentator after 1990?
SELECT "Network" FROM table_62607 WHERE "Year" > '1990' AND "Colour commentator(s)" = 'chris walby'
SELECT "Network" FROM "table_62607" WHERE "Colour commentator(s)" = 'chris walby' AND "Year" > '1990'