Returns the range of years available from different SC data sources.
Examples
get_available_years()
#> [1] 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026
get_available_years("headcounts")
#> [1] 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026
get_available_years("reportcards")
#> [1] 2018 2019 2020 2021 2022 2023 2024 2025