<Tr> <Th> 33 </Th> <Td> 16 </Td> <Td> "The Cushion Saturation" </Td> <Td> Mark Cendrowski </Td> <Td> Story by: Chuck Lorre Teleplay by: Bill Prady & Lee Aronsohn </Td> <Td> March 2, 2009 (2009 - 03 - 02) </Td> <Td> 3T7366 </Td> <Td> 10.94 </Td> </Tr> <Tr> <Th> 34 </Th> <Td> 17 </Td> <Td> "The Terminator Decoupling" </Td> <Td> Mark Cendrowski </Td> <Td> Story by: Bill Prady & Dave Goetsch Teleplay by: Tim Doyle & Stephen Engel </Td> <Td> March 9, 2009 (2009 - 03 - 09) </Td> <Td> 3T7367 </Td> <Td> 9.46 </Td> </Tr> <Tr> <Th> 35 </Th> <Td> 18 </Td> <Td> "The Work Song Nanocluster" </Td> <Td> Peter Chakos </Td> <Td> Story by: Bill Prady & Lee Aronsohn Teleplay by: Dave Goetsch & Richard Rosenstock </Td> <Td> March 16, 2009 (2009 - 03 - 16) </Td> <Td> 3T7368 </Td> <Td> 9.76 </Td> </Tr> <Tr> <Th> 36 </Th> <Td> 19 </Td> <Td> "The Dead Hooker Juxtaposition" </Td> <Td> Mark Cendrowski </Td> <Td> Steven Molaro </Td> <Td> March 30, 2009 (2009 - 03 - 30) </Td> <Td> 3T7369 </Td> <Td> 9.77 </Td> </Tr>

How many episodes of big bang theory per season