[datetime.date(2017, 1, 5),
datetime.date(2017, 6, 14),
datetime.date(2017, 9, 13),
datetime.date(2017, 12, 13),
datetime.date(2018, 3, 14),
datetime.date(2018, 6, 13),
datetime.date(2018, 9, 12),
datetime.date(2018, 12, 12),
datetime.date(2019, 3, 13),
datetime.date(2019, 6, 12),
datetime.date(2019, 9, 11),
datetime.date(2019, 12, 11),
datetime.date(2020, 3, 11),
datetime.date(2020, 6, 10),
datetime.date(2020, 9, 9),
datetime.date(2020, 12, 9),
datetime.date(2021, 3, 10),
datetime.date(2021, 6, 9),
datetime.date(2021, 9, 8)]