CREATE TABLE table_21957 ("Name" CLOB, "Map colour" CLOB, "First operated" FLOAT, "Type" CLOB, "Length" CLOB, "No. Sta" FLOAT, "Current Stock" CLOB, "Future Stock" CLOB, "Trips per annum  ( \\u00d71000 ) " FLOAT, "Avg. trips per mile  ( \\u00d71000 ) " FLOAT)

When green is the map colour what is the future stock?
SELECT "Future Stock" FROM table_21957 WHERE "Map colour" = 'Green'
SELECT "Future Stock" FROM "table_21957" WHERE "Map colour" = 'Green'