Seasons
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Season 1
8 episodes
2006
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Season 2
8 episodes
2007
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Season 3
4 episodes
2008
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Season 4
8 episodes
2008
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Season 5
4 episodes
2009
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Season 6
6 episodes
2009
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Season 7
8 episodes
2009
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Season 8
8 episodes
2010
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Season 9
8 episodes
2012
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Season 10
8 episodes
2013
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Season 11
8 episodes
2014
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Season 12
8 episodes
2015
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Season 13
7 episodes
2016
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Season 14
6 episodes
2017
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Season 15
8 episodes
2018
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Season 16
8 episodes
2019
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Season 17
8 episodes
2020
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Season 18
10 episodes
2021
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Season 19
10 episodes
2025