Teacher classification shall be such classification as determined in Article 3.01 in force on the first day of January, 2018 for the 2018 calendar year, on the first day of January, 2019 for the 2019 calendar year, on the first day of January, 2020 for the 2020 calendar year, on the first day of January, 2021 for the 2021 calendar year and on the first day of January, 2022 for the 2022 calendar year.