Season 1 PBS , 2006 - 2007 Watch now Season 2 PBS , 2007 - 2008 Watch now Season 3 PBS , 2008 - 2009 Watch now Season 4 PBS , 2009 - 2010 Watch now Season 5 PBS , 2010 - 2011 Watch now Season 6 PBS , 2011 - 2012 Watch now Season 7 PBS , 2012 - 2013 Watch now Season 8 PBS , 2014 Watch now Season 9 PBS , 2014 - 2015 Watch now Season 10 Peacock , 2018 Watch now Season 11 Peacock , 2019 Watch now Season 12 Peacock , 2020 Watch now Season 13 PBS , 2020 Watch now Season 14 Peacock , 2021 Watch now Season 15 Peacock , 2022 Watch now
, 2006 - 2007
, 2007 - 2008
, 2008 - 2009
, 2009 - 2010
, 2010 - 2011
, 2011 - 2012
, 2012 - 2013
, 2014 - 2015
