Seasons
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Season 1
16 episodes
2004
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Season 2
16 episodes
2005
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Season 3
12 episodes
2006
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Season 4
16 episodes
2007
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Season 5
16 episodes
2008
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Season 6
16 episodes
2009
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Season 7
16 episodes
2010
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Season 8
16 episodes
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Season 9
16 episodes
2012
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Season 10
16 episodes
2013
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Season 11
16 episodes
2014
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Season 12
16 episodes
2015
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Season 13
16 episodes
2016
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Season 14
18 episodes
2017
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Season 15
18 episodes
2018
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Season 16
18 episodes
2019
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Season 17
16 episodes
2020
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Season 18
18 episodes
2021
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Season 19
12 episodes
2022