pre_text: North America North America net revenues increased $710,000 in 2019 compared to 2018 (see “Revenues” above). North America expenses decreased $2.2 million from 2018 to 2019 primarily due to a $1.7 million decrease in salary and employee related expenses, $742,000 decrease in professional service expenses, a $584,000 decrease in customer service costs and a $498,000 decrease in trade and brand marketing expenses, offset partially by a $1.2 million increase in member acquisition costs.
table: Year Ended December 31,
table: 2019 2018
table: (In thousands)
table: Revenues $68,024 $67,314
table: Income from operations $12,491 $9,587
table: Income from operations as a % of revenues 18% 14%
question: Analyse this data from a financial earnings document. What is the average amount of revenues for 2018 and 2019?