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| Percent Change in Average Retail Petroleum Prices, Month over Month & Year to Date | 
| 
 | 
May '21 | 
Apr '21 | 
% Change | 
May '20 | 
% Change | 
| Diesel | 
$3.02 | 
$3.08 | 
-1.9% | 
$2.67 | 
13.1% | 
| Kerosene | 
$3.07 | 
$3.11 | 
-1.3% | 
$2.35 | 
30.8% | 
| No. 2 Fuel Oil | 
$2.64 | 
$2.67 | 
-1.1% | 
$1.88 | 
40.2% | 
| Propane | 
$2.66 | 
$2.81 | 
-5.3% | 
$2.21 | 
20.5% | 
| Regular Gasoline | 
$2.84 | 
$2.80 | 
1.4% | 
$1.90 | 
49.5% |