World record progression 100 metres backstroke

Columns: Time | Swimmer | Date | Place
50.58 | Thomas Rupprath | December 8 , 2002 | Melbourne , Australia | 50.32 | Peter Marshall | March 26 , 2004 | New York City , United States | 49.99 | Ryan Lochte | April 9 , 2006 | Shanghai , China | 49.94 | Peter Marshall | November 11 , 2008 | Stockholm , Sweden | 49.63 | Peter Marshall | November 15 , 2008 | Berlin , Germany | 49.32 | Stanislav Donets | December 14 , 2008 | Rijeka , Croatia | 49.20 | Aschwin Wildeboer | December 21 , 2008 | Madrid , Spain

Example questions:
What nationality is the Men 's World record progression 100 metres backstroke swimmer with a time of 52.71 seconds ? | How many Olympic gold medals did the Men 's World record progression 100 metres backstroke swimmer with a time of 51.28 seconds win ? | How many times has the Men 's World record progression 100 metres backstroke swimmer with the shortest time been named world champion ?

Answers:
Canadian | four | twice