Season 1 History , 2009 Watch now Season 2 History , 2010 Watch now Season 3 History , 2010 - 2011 Watch now Season 4 History , 2011 Watch now Season 5 History , 2011 - 2012 Watch now Season 6 History , 2012 Watch now Season 7 History , 2012 - 2013 Watch now Season 8 History , 2013 Watch now Season 9 History , 2014 Watch now Season 10 History , 2014 Watch now Season 11 History , 2015 Watch now Season 12 History , 2015 - 2016 Watch now Season 13 History , 2016 - 2017 Watch now Season 14 History , 2017 Watch now Season 15 History , 2017 - 2018 Watch now Season 16 History , 2019 Watch now Season 17 History , 2019 - 2020 Watch now Season 18 History , 2020 - 2021 Watch now Season 19 History , 2021 Watch now Season 20 History , 2022 Watch now Season 21 History , 2023 Watch now