pre_text: Cost of Revenues Our Products and Licensing segment costs increased $8.6 million to $16.7 million for the year ended December 31, 2019 compared to $8.1 million for the year ended December 31, 2018. This increase primarily resulted from $3.9 million of cost of revenues from the legacy business of MOI and $4.4 million of cost of revenues from the legacy business of GP during the year ended December 31, 2019, as well as an increase in sales volume. Our Technology Development segment costs increased $3.2 million, to $18.6 million for the year ended December 31, 2019 compared to $15.4 million for the year ended December 31, 2018. The overall increase in Technology Development segment costs was driven by increases in direct labor and subcontractor costs consistent with the rate of growth in Technology Development segment revenues.
table: Years ended December 31,
table: 2019 2018 $ Difference  % Difference
table: Products and licensing costs $16,684,172 $8,078,870 $8,605,302 106.5%
table: Technology development costs 18,649,161 15,400,475 3,248,686 21.1%
table: Total costs of revenues $35,333,333 $23,479,345 $11,853,988 50.5%
question: Analyse this data from a financial earnings document. What is the average Products and licensing costs for December 31, 2018 and 2019?