pre_text: Trade and Other Receivables Unbilled revenues represent amounts not yet billed to merchants related to subscription fees for Plus merchants, transaction fees and shipping charges, as at the Consolidated Balance Sheet date. Expressed in US $000's except share and per share amounts
table: December 31, 2019 December 31, 2018 January 1, 2018
table: $ $ $
table: Indirect taxes receivable 36,821 3,774 832
table: Unbilled revenues 31,629 12,653 7,616
table: Trade receivables 9,660 11,191 7,073
table: Accrued interest 5,754 5,109 2,015
table: Other receivables 6,665 8,620 4,403
table: 90,529 41,347 21,939
question: Analyse this data from a financial earnings document. What is the average trade receivables for 2018 and 2019?