CREATE TABLE table_203_154 (id NUMBER, "type" CLOB, "manufacturer" CLOB, "numbers" CLOB, "year built" NUMBER, "quantity built" NUMBER, "power  ( horsepower ) " NUMBER, "max speed  ( km/h ) " NUMBER, "note" CLOB)

what year was the first unit built according to this chart ?
SELECT MIN("year built") FROM table_203_154
SELECT MIN("year built") FROM "table_203_154"