CREATE TABLE table_203_447 (id DECIMAL, "constituency" DECIMAL, "region" TEXT, "name" TEXT, "party" TEXT, "last elected" DECIMAL)

what is the difference in years between constiuency 1 and 2 ?
SELECT (SELECT "last elected" FROM table_203_447 WHERE "constituency" = 1) - (SELECT "last elected" FROM table_203_447 WHERE "constituency" = 2)
SELECT (SELECT "last elected" FROM "table_203_447" WHERE "constituency" = 1) - (SELECT "last elected" FROM "table_203_447" WHERE "constituency" = 2)