Season 1 PBS , 2013 - 2014 Season 2 PBS , 2014 Season 3 PBS , 2015 Season 4 PBS , 2016 Season 5 PBS , 2017 Season 6 PBS , 2018 Season 7 PBS , 2019 Season 8 PBS , 2020 - 2021 Season 9 PBS , 2022 - 2023 Season 10 PBS , 2023