Table:
text: List of bus routes in San Diego
Current bus fleet roster
Current bus fleet roster
Order_Year Fleet_Series_Qty_ Manufacturer Model Powertrain_Engine_Transmission Fuel_or_Propulsion Division
2005 2701-2740 (40) New Flyer C40LF Cummins Westport C-Gas Plus ZF 6HP CNG SBD
2007 2771-2775 (5) ElDorado National EZ Rider II CNG Cummins Westport B-Gas Plus Allison WB-300R CNG SBD
2007 8501-8526 (26) Blue Bird Express 4500 Detroit Diesel Series 60EGR Allison WB-500 Diesel ECD
2008 301-350 (50) New Flyer C40LF Cummins Westport ISL-G ZF 6HP CNG IAD: 301-313 KMD: 314-350
2008 1001-1026 (26) NABI 60-BRT Cummins Westport ISL-G Allison WB-500R CNG IAD
2009 501-512 (12) New Flyer GE40LFR Ford Triton V10 6.8L ISE Thundervolt TB40-HG Hybrid IAD
2009 2801-2870 (70) New Flyer C40LF Cummins Westport ISL-G ZF 6HP CNG SBD
2011 601-627 (27) New Flyer C40LFR Cummins Westport ISL-G ZF 6HP CNG IAD

Question: Name the manufacturer of bus routes in San Diego as of 2011?