Season 1 PBS Season 4 PBS , 1987 Season 25 PBS , 2016 Season 29 PBS , 2011 - 2013 Season 30 PBS , 2012 - 2013 Season 31 PBS , 2013 - 2014 Season 32 PBS , 2014 - 2017 Season 33 PBS , 2015 - 2016 Season 34 PBS , 2016 - 2021 Season 35 PBS , 2017 - 2021 Season 36 PBS , 2018 - 2020 Season 37 PBS , 2019 - 2020 Season 38 PBS , 2020 - 2022 Season 39 PBS , 2021 - 2023 Season 40 PBS , 2022 - 2023 Season 41 PBS , 2023 - 2024