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Producer Price Index 2018 Benchmark seasonal factors - PPI for unleaded regular gasoline, 2015-2017</span>  </caption> <thead><tr><th style=\"vertical-align: middle; min-width: 80px;\" rowspan=\"1\" scope=\"col\">Date</th><th scope=\"col\">PPI for unleaded regular gasoline</th></tr></thead> <tbody><tr><th scope=\"row\"><p>Jan-15</p></th><td>91.0</td></tr><tr class=\"greenbar\"><th scope=\"row\"><p>Feb-15</p></th><td>91.1</td></tr><tr><th scope=\"row\"><p>Mar-15</p></th><td>96.1</td></tr><tr class=\"greenbar\"><th scope=\"row\"><p>Apr-15</p></th><td>102.0</td></tr><tr><th scope=\"row\"><p>May-15</p></th><td>106.3</td></tr><tr class=\"greenbar\"><th scope=\"row\"><p>Jun-15</p></th><td>107.6</td></tr><tr><th scope=\"row\"><p>Jul-15</p></th><td>106.4</td></tr><tr class=\"greenbar\"><th scope=\"row\"><p>Aug-15</p></th><td>105.9</td></tr><tr><th scope=\"row\"><p>Sep-15</p></th><td>104.0</td></tr><tr class=\"greenbar\"><th scope=\"row\"><p>Oct-15</p></th><td>100.7</td></tr><tr><th 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