Season 1 PBS Season 2007 Syndication , 2007 Season 2011 PBS , 2011 Season 2012 PBS , 2012 Season 2013 PBS , 2013 Season 2014 PBS , 2014 Season 2015 PBS , 2015 Season 2016 PBS , 2016 Season 2017 PBS , 2017 Season 2018 Syndication , 2018 Season 2019 Season 2019 Syndication , 2019 Season 2020 Syndication , 2020 Season 2021 Syndication , 2021 Season 2022 Syndication , 2022 Season 2023 Syndication , 2023 Season 2024 Syndication , 2024