user: Question: What is the Propulsion for the model offered in 2003-2004 by Neoplan USA?
Columns: ['Order Year', 'Manufacturer', 'Model', 'Fleet (Qty.)', 'Propulsion', 'Length (ft.)']
Types: ['text', 'text', 'text', 'text', 'text', 'real']
Sample row: ['1994', 'TMC', 'RTS T80206', '0001-0138 (138)', 'Diesel', 40.0]
SQL:

assistant: SELECT "Propulsion" FROM "Table" WHERE "Order Year" = '2003-2004' AND "Manufacturer" = 'Neoplan USA';