| period | Period | mandatory (in range)
 | in range Year: YYYY,YYYY
 Quarter: YYYYXX,YYYYXX XX=03,06,09 or 12
 Month: YYYYMM,YYYYMM MM=01 to 12
 
 | Examples Year: 2015,2017 refers to year 2015-2017
 Quarter:
 201706,201712 refers to Q2-Q4 2017
 201703,201703 refers to Q1 2017
 Month: 201701,201712 refers to Jan-Dec 2017
 |