What is the Propulsion for the model offered in 2003-2004 by neoplan usa?
CREATE TABLE table_name_68 (
    propulsion VARCHAR,
    order_year VARCHAR,
    manufacturer VARCHAR
)
SELECT propulsion FROM table_name_68 WHERE order_year = "2003-2004" AND manufacturer = "neoplan usa"
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: What is the Propulsion for the model offered in 2003-2004 by neoplan usa? ### Input: CREATE TABLE table_name_68 (
    propulsion VARCHAR,
    order_year VARCHAR,
    manufacturer VARCHAR
) ### Response: SELECT propulsion FROM table_name_68 WHERE order_year = "2003-2004" AND manufacturer = "neoplan usa"