| 
				 Year  | 
			
				 Jan.  | 
			
				 Feb.  | 
			
				 March  | 
			
				 April  | 
			
				 May  | 
			
				 June  | 
			
				 July  | 
			
				 Aug.  | 
			
				 Sept.  | 
			
				 Oct.  | 
			
				 Nov.  | 
			
				 Dec.  | 
			
				 Average  | 
		
| 
				 2014  | 
			
				 6.1043  | 
			
				 6.1128  | 
			
				 6.1358  | 
			
				 6.1553  | 
			
				 6.1636  | 
			
				 6.1557  | 
			
				 6.1569  | 
			
				 6.1606  | 
			
				 6.1528  | 
			
				 6.1441  | 
			
				 6.1432  | 
			
				 6.1238  | 
			
				 6.1428  | 
		
| 
				 2015  | 
				 6.1272  | 
				 6.1339  | 
				 6.1507  | 
				 6.1302  | 
				 6.1143  | 
				 6.1161  | 
				 6.1167  | 
				 6.3056  | 
				 6.3691  | 
				 6.3486  | 
				 6.3666  | 
				 6.4476  | 
				 6.2288  | 
| 
				 2016  | 
				 6.5527  | 
				 6.5311  | 
				 6.5064  | 
				 6.4762  | 
				 6.5315  | 
				 6.5874  | 
				 6.6774  | 
				 6.6474  | 
				 6.6715  | 
				 6.7442  | 
				 6.8375  | 
				 6.9182  | 
				 6.6425  | 
| 
				 2017  | 
				 6.8918  | 
				 6.8713  | 
				 6.8932  | 
				 6.8845  | 
				 6.8827  | 
				 6.8019  | 
				 6.7772  | 
				 6.7148  | 
				 6.5909  | 
				 6.6493  | 
				 6.6300  | 
				 6.6067  | 
				 6.7662  | 
| 
				 2018  | 
				 6.5079  | 
				 6.3045  | 
				 6.3352  | 
				 6.2764  | 
				 6.3670  | 
				 6.4078  | 
				 6.6157  | 
				 6.8293  | 
				 6.8347  | 
				 6.8957  | 
				 6.9670  | 
				 6.9431  | 
				 6.6070  | 
| 
				 2019  | 
				 6.8482  | 
				 6.7081  | 
				 6.6957  | 
				 6.7193  | 
				 6.7344  | 
				 6.8896  | 
				 -  | 
				 -  | 
				 -  | 
				 -  | 
				 -  | 
				 -  | 
				 -  |