pre_text: Key Performance Indicators Key performance indicators, which we do not consider to be non-GAAP measures, that we use to evaluate our business, measure our performance, identify trends affecting our business, formulate financial projections and make strategic decisions include Monthly Recurring Revenue ("MRR") and Gross Merchandise Volume ("GMV"). Our key performance indicators may be calculated in a manner different than similar key performance indicators used by other companies. The following table shows MRR and GMV for the years ended December 31, 2019 and 2018.
table: Years ended December 31,
table: 2019 2018
table: (in thousands)
table: Monthly Recurring Revenue $53,898 $40,932
table: Gross Merchandise Volume $61,138,457 $41,103,238
question: Analyse this data from a financial earnings document. What is the average gross merchandise volume for 2018 and 2019?