Month Millions of Dollars 2011-01-01 0.000000000000000 2011-02-01 0.000000000000000 2011-03-01 0.000000000000000 2011-04-01 0.000000000000000 2011-05-01 28.495809000000005 2011-06-01 30.351814000000008 2011-07-01 90.820473000000000 2011-08-01 78.392138999999990 2011-09-01 56.863716000000010 2011-10-01 85.955507999999980 2011-11-01 42.039881999999990 2011-12-01 71.281647000000020 2012-01-01 27.240134000000000 2012-02-01 32.164460000000000 2012-03-01 122.126990000000000 2012-04-01 94.306131000000000 2012-05-01 106.170091000000000 2012-06-01 59.628777000000000 2012-07-01 59.041696000000000 2012-08-01 43.421068000000000 2012-09-01 32.719300000000000 2012-10-01 30.710612000000000 2012-11-01 54.012620000000000 2012-12-01 30.400253000000000 2013-01-01 29.587633000000000 2013-02-01 56.243620000000000 2013-03-01 34.894701000000000 2013-04-01 64.244320000000000 2013-05-01 131.442404000000000 2013-06-01 63.598177000000000 2013-07-01 28.673293000000000 2013-08-01 60.932980000000000 2013-09-01 55.188173000000000 2013-10-01 29.982876000000000 2013-11-01 66.842838000000000 2013-12-01 65.883133000000000 2014-01-01 56.036583000000000 2014-02-01 59.555582000000000 2014-03-01 33.082582000000000 2014-04-01 42.368730000000000 2014-05-01 31.074096000000000 2014-06-01 44.042880000000000 2014-07-01 58.390405000000000 2014-08-01 30.807708000000000 2014-09-01 39.111837000000000 2014-10-01 74.708679000000000 2014-11-01 58.968759000000000 2014-12-01 83.450265000000000 2015-01-01 26.235727000000000 2015-02-01 44.473821000000000 2015-03-01 60.215240000000000 2015-04-01 76.495716000000000 2015-05-01 68.274746000000000 2015-06-01 28.306023000000000 2015-07-01 42.121509000000000 2015-08-01 26.231239000000000 2015-09-01 26.063493000000000 2015-10-01 46.197933000000000 2015-11-01 47.909635000000000 2015-12-01 28.732231000000000 2016-01-01 45.930441000000000 2016-02-01 55.047031000000000 2016-03-01 122.452068000000000 2016-04-01 168.131526000000000 2016-05-01 134.782967000000000 2016-06-01 58.131963000000000 2016-07-01 28.753363000000000 2016-08-01 48.704703000000000 2016-09-01 52.319620000000000 2016-10-01 34.761161000000000 2016-11-01 30.029286000000000 2016-12-01 97.842606000000000 2017-01-01 39.075841000000000 2017-02-01 91.160888000000000 2017-03-01 70.557145000000000 2017-04-01 33.553819000000000 2017-05-01 77.209995000000000 2017-06-01 48.495827000000000 2017-07-01 64.395106000000000 2017-08-01 53.275117000000000 2017-09-01 23.871996000000000 2017-10-01 27.168377000000000 2017-11-01 27.155416000000000 2017-12-01 136.248271000000000 2018-01-01 94.806868000000000 2018-02-01 126.697604000000000 2018-03-01 143.929181000000000 2018-04-01 185.422081000000000 2018-05-01 70.409325000000000 2018-06-01 30.364465000000000 2018-07-01 19.570322000000000 2018-08-01 38.804325000000000 2018-09-01 58.600266000000000 2018-10-01 21.373523000000000