What’s the best way to track inventories including tankers being used for storage.
http://www.eia.gov/dnav/pet/pet_stoc_wstk_dcu_nus_w.htm
https://www.iea.org/oilmarketreport/omrpublic/charts/
http://www.eia.gov/beta/international/data/browser/#?ord=CR&cy=201503&v=H&vo=0&so=0&io=0&start=195606&end=201503&vs=INTL.5-5-AFRC-MBBL.Q~INTL.5-5-ASOC-MBBL.Q~INTL.5-5-CSAM-MBBL.Q~INTL.5-5-EURA-MBBL.Q~INTL.5-5-EURO-MBBL.Q~INTL.5-5-MIDE-MBBL.Q~INTL.5-5-NOAM-MBBL.Q~INTL.5-5-WORL-MBBL.Q&c=4100000002000060000000000000g000200000000000000001&pa=00000000000000000000000000000000000004&f=Q&ug=g&ct=1&tl_type=p&tl_id=5-Q&s=