| 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
				 |