pre_text: Other income (expense) nm—not meaningful Interest income increased $1.2 million primarily as a result of higher weighted-average balances of cash, cash equivalents and investments and higher yields on investments. Interest expense increased $5.3 million primarily as a result of interest expense of $3.3 million associated with our long-term debt and our financing lease obligation of $2.0 million in connection with the construction of our Lexington, MA – U.S. headquarters. Foreign exchange expense and other, net decreased by $3.1 million primarily as a result of a decrease in foreign exchange expense of $1.9 million, sublease income of $0.9 million and a gain on a previously held asset related to the Solebit acquisition of $0.3 million.
table: Year ended March 31, Period-to-period change
table: 2019 2018 Amount % Change
table: (dollars in thousands)
table: Other income (expense):
table: Interest income $ 2,515 $ 1,310 $ 1,205 92 %
table: Interest expense (5,940) (598) (5,342) nm
table: Foreign exchange expense and other, net (356) (3,439) 3,083 nm
table: Total other income (expense), net $ (3,781) $ (2,727) $ (1,054) nm
question: Analyse this data from a financial earnings document. What was the average interest income for 2018 and 2019?