Season 1 PBS , 2002 Watch now Season 2 PBS , 2003 Watch now Season 3 PBS , 2004 Watch now Season 4 PBS , 2005 Watch now Season 5 PBS , 2006 - 2007 Watch now Season 6 PBS , 2007 - 2008 Watch now Season 7 PBS , 2009 Watch now Season 8 PBS , 2010 Watch now Season 9 PBS , 2013 - 2014 Watch now Season 10 PBS , 2015 Watch now Season 11 PBS , 2017 - 2018 Watch now Season 12 PBS , 2019 - 2020 Watch now Season 13 PBS , 2022 Watch now Season 14 PBS , 2023 Watch now Season 15 PBS , 2024 Watch now Season 16 PBS , 2026
, 2006 - 2007
, 2007 - 2008
, 2013 - 2014
, 2017 - 2018
, 2019 - 2020
