Season 1 , 2007 Season 2 , 2008 Season 3 , 2009 Season 4 , 2010 Season 5 , 2011 Season 6 , 2012 Season 7 , 2012 Season 8 , 2013 Season 9 , 2013 Season 10 , 2014 Season 11 , 2014 Season 12 , 2015 Season 13 , 2015 Season 14 , 2016 Season 15 NPO 2 , 2016 Season 16 NPO 2 , 2017 Season 17 NPO 2 , 2017 Season 18 NPO 2 , 2018 Season 19 NPO 2 , 2019 Season 20 KRO-NCRV , 2021 Season 21 KRO-NCRV , 2021