Table:
text: Valley Metro (Phoenix) bus fleet
Active
Active
Make_Model length_ Year_ Numbers_Quantity_Ordered Fuel_Propulsion
New Flyer D60LF 60` 2008 8051-8064 (14 buses) Diesel
New Flyer D62LFA 62` 2008 8511-8520 (10 buses) Diesel
ElDorado National Aerotech 25` 2008 1521, 1529 (2 buses) Bio-Diesel
New Flyer C40LFR 40` 2009 6648-6668 (21 buses) CNG
New Flyer L40LFR 40` 2010 6669-6675 (7 buses) LNG
New Flyer D42LFA 40` 2010 7001-7009 (9 buses) Diesel
ElDorado National Passport 30` 2010 Unknown Diesel
New Flyer C40LFR 40` 2011 6676-6697 (22 buses) CNG
New Flyer DE60LFR 60` 2011 8065-8081 (17 buses) Diesel-electric Hybrid
New Flyer C40LFR 40` 2012 6698-6713 (16 buses) CNG
New Flyer C40LFR 40` 2012 6714-6733 (20 buses) CNG
New Flyer MiDi 30` 30` 2013 T101 (1 bus) Diesel

text: Valley Metro (Phoenix) bus fleet
Active
Active
Make_Model length_ Year_ Numbers_Quantity_Ordered Fuel_Propulsion
StarTrans Replica Trolley 30` 2004 5001-5007 (7 buses) Bio-Diesel
StarTrans Senator 25` 2005 Unknown Diesel
ElDorado National Aerotech 25` 2005 Unknown Diesel
StarTrans Replica Trolley 30` 2006 5008-5014 (7 buses) Bio-Diesel
New Flyer C40LFR 40` 2006 6401-6452 (52 buses) CNG
NABI 60-BRT 60` 2006 8501-8510 (10 buses) CNG
New Flyer D40LFR 40` 2007 6453-6456 (4 buses) Diesel
New Flyer D40LFR 40` 2007 6457-6460, 6481-6500 (24 buses) Diesel
New Flyer D40LF 40` 2007 6501-6596 (96 buses) Diesel
New Flyer D60LF 60` 2007 8021-8050 (30 buses) Diesel
StarTrans Senator 25` 2007 1461–1500 (40 buses) Gasoline
ElDorado National Aerotech 25` 2008 Unknown Diesel
New Flyer C40LFR 40` 2008 6597-6647 (51 buses) CNG

Question: How many years is the make/model of the new Valley Metro (Phoenix) bus fleet flyer c40lfr active S?