CREATE TABLE table_202_150 (id DECIMAL, "election" DECIMAL, "member" TEXT, "party" TEXT)

how many years after sir carne rasch 's election was john macnamara elected ?
SELECT (SELECT "election" FROM table_202_150 WHERE "member" = 'john macnamara') - (SELECT "election" FROM table_202_150 WHERE "member" = 'sir carne rasch, bt')
SELECT (SELECT "election" FROM "table_202_150" WHERE "member" = 'john macnamara') - (SELECT "election" FROM "table_202_150" WHERE "member" = 'sir carne rasch, bt')