pre_text: GasLog Ltd. and its Subsidiaries
  Notes to the consolidated financial statements (Continued)
  For the years ended December 31, 2017, 2018 and 2019
  (All amounts expressed in thousands of U.S. Dollars, except share and per share data) 18. Revenues from Contracts with Customers The Group has recognized the following amounts relating to revenues: Revenues from The Cool Pool Limited relate only to the pool revenues received from GasLog’s vessels operating in the Cool Pool and do not include the Net pool allocation to GasLog of ($4,264) for the year ended December 31, 2019 ($17,818 for the year ended December 31, 2018 and $7,254 for the year ended December 31, 2017), which is recorded as a separate line item in the Profit or Loss Statement. Following the exit from the Cool Pool, management allocates revenues from time charters to two categories: (a) variable rate charters and (b) fixed rate charters. The variable rate charter category contains vessels operating in the LNG carrier spot and short-term market or those which have a variable rate of hire across the charter period.
table: For the year ended December 31,
table: 2017 2018 2019
table: Revenues from fixed rate time charters 485,961 515,324 558,266
table: Revenues from variable rate time charters — — 64,334
table: Revenues from The Cool Pool Limited (GasLog vessels) 38,046 102,253 45,253
table: Revenues from vessel management services 1,222 767 784
table: Total 525,229 618,344 668,637
question: Analyse this data from a financial earnings document. What was the change in revenues from The Cool Pool Limited  from 2017 to 2018?