Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Order Year | Manufacturer | Model | Fleet (Qty.) | Propulsion | Length (ft.) |
| --- | --- | --- | --- | --- | --- |
| 1994 | TMC | RTS T80206 | 0001-0138 (138) | Diesel | 40.0 |
| 1995 | NovaBus | RTS T80206 | 0139-0400 (262) | Diesel | 40.0 |
| 1999 | NFI | C40LF | 6000-6001 (2) | CNG | 40.0 |
| 2001 | NFI | C40LF | 6002-6016 (15) | CNG | 40.0 |
| 2003-2004 | NABI | 40-LFW | 2001-2299 (299) | CNG | 40.0 |
| 2003-2004 | Neoplan USA | AN460LF | 1001-1044 (44) | CNG | 60.0 |
| 2004 | Neoplan USA | AN440LF | 4101-4128 (28) | Electric trolleybus | 40.0 |
| 2004-2005 | Neoplan USA | AN440LF | 0401-0593 (193) | Diesel | 40.0 |
| 2004-2005 | Neoplan USA | AN460LF | 1101-1132 (32) | Dual mode | 60.0 |
| 2006-2007 | NFI | D40LF | 0600-0754 (155) | Diesel | 40.0 |
| 2008 | NFI | D40LF | 0755-0909 (155) | Diesel | 40.0 |
| 2010 | NFI | DE60LFR | 1200-1224 (25) | Hybrid | 60.0 |
Question:
What is the Propulsion for the model offered in 2003-2004 by neoplan usa?
Answer:
CNG