Table of Contents different pricing structures. In some cases we also use discounts to encourage longer contract terms. Our growing membership base combined with increasing average commitment lengths has provided increased visibility as to future revenues as we continue to scale globally, driving an increase in our committed revenue backlog from approximately $0.5 billion as of December 31, 2017 to approximately $4.0 billion as of June 30, 2019. We calculate average revenue per WeWork membership by dividing our membership and service revenue (other than membership and service revenue from our WeLive offering and related services and other than management fee income from services provided to IndiaCo) by the average number of WeWork memberships in the relevant period. Other revenue increased $136.8 million, primarily related to a $63.6 million increase in revenue generated from our Powered by We solutions and $30.9 million related to growth in our mature ventures. The remaining $42.3 million was primarily driven by a reimbursement for services performed for an affiliate in connection with Creator Award events received during the six months ended June 30, 2019. Comparison of the Year Ended December 31, 2017 and the Year Ended December 31, 2018 Year Ended December 31, Change (Amounts in thousands, except percentages) 2017 2018 $ % Revenue $ 886,004 $ 1,821,751 $ 935,747 106% Total revenue increased $935.7 million to $1.8 billion for the year ended December 31, 2018, primarily driven by an increase in membership and service revenue, which increased $830.4 million to $1.7 billion for the year ended December 31, 2018, from $866.9 million for the year ended December 31, 2017. The growth in revenue was primarily driven by growth in our membership base. The WeWork community has grown to approximately 387,000 memberships as of December 31, 2018 from 183,000 as of December 31, 2017. The increase in membership and service revenue due to growth in our membership base was slightly offset by a decline of approximately $46 million driven by a decline in average revenue per WeWork membership for the year ended December 31, 2018 as compared to the year ended December 31, 2017. Average revenue per WeWork membership has experienced a decline primarily due to our expansion into global markets with different pricing structures. In some cases we also use discounts to attract members as we open new locations at a faster rate, or to encourage longer contract terms. Other revenue increased $105.3 million to $124.4 million for the year ended December 31, 2018, from $19.1 million for the year ended December 31, 2017, due to the acquisition of several companies including Meetup, Flatiron School and Conductor and revenue from our Powered by We solutions and various other activities not directly related to our workplace solutions. Comparison of the Year Ended December 31, 2016 and the Year Ended December 31, 2017 Year Ended December 31, Change (Amounts in thousands, except percentages) 2016 2017 $ % Revenue $ 436,099 $ 886,004 $ 449,905 103% Total revenue increased $449.9 million to $886.0 million for the year ended December 31, 2017, primarily driven by an increase in membership and service revenue, which increased $432.5 million to $866.9 million for the year ended December 31, 2017 from $434.4 million for the year ended December 31, 2016. The growth in revenue was primarily driven by growth in our membership base. The WeWork community has grown to approximately 183,000 memberships as of December 31, 2017 from 87,000 as of December 31, 2016. Additionally, we opened two WeLive locations during 2016. 93