Season
- Season 1 2006-05-11
- Season 2 2007-09-06
- Season 3 2008-11-20
- Season 4 2009-09-10
- Season 5 2011-03-10
- Season 6 2012-04-26
- Season 7 2013-02-28
- Season 8 2014-02-27
- Season 9 2015-02-05
- Season 10 2016-01-28
- Season 11 2017-01-05
- Season 12 2018-03-01
- Season 13 2019-03-07
- Season 14 2021-01-28
- Season 15 2022-04-16
- Season 16 2024-02-01
Research Unit - Season 4 Episode 3
8.20 60 minutes 
