year/month	month	month	month
2021
Jan-March	April-June	July-Sept	Oct-Dec
2020
Jan-March	April-June	July-Sept	Oct-Dec
2019
Jan-March	April-June	July-Sept	Oct-Dec
2018
Jan-March	April-June	July-Sept	Oct-Dec
2017
Jan-March	April-June	July-Sept	Oct-Dec
2016
Jan-March	April-June	July-Sep	Oct-Dec
2015
Jan-March	April-June	July-Sep	Oct-Dec
2014
jan-March	April-June	July-Sep	Oct-Dec
2013
Jan.-March	April-June	July-Sept.	Oct.-Dec.
2012
Jan.-March	April-June	July-Sept.	Oct.-Dec.
2011
Jan.-March	April-June	July-Sept.	Oct.-Dec.