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dollar against those currency exposures as of December 31, 2020 and 2019.
−Removed: As of December 31, 2019 , our net working capital deficit (defined as current assets less current liabilities) from subsidiaries that are subject to foreign currency translation risk was $69.2 million .
−Removed: The potential increase in this working capital deficit from a hypothetical 10% adverse change in quoted foreign currency exchange rates would be $6.9 million .
+Added: As of December 31, 2020, our net working capital surplus (defined as current assets less current liabilities) from subsidiaries that are subject to foreign currency translation risk was $11.4 million.
+Added: The potential increase in this working capital surplus from a hypothetical 10% adverse change in quoted foreign currency exchange rates would be $1.1 million.
This compares to a $69.2 million working capital deficit subject to foreign currency exposure as of December 31, 2019, for which a 10% adverse change would have resulted in a potential increase in this working capital deficit of $6.9 million.
Interest Rate Risk
−Removed: Our cash balance as of December 31, 2019 consists of bank deposits, so exposure to market risk for changes in interest rates is limited.
−Removed: In April 2016, we issued convertible notes with an ag gregate principal amount of $250.0 million (see Item 8, Note 9 , Financing Arrangements ).
+Added: Our cash balance as of December 31, 2020 consists of bank deposits and government money market funds, so exposure to market risk for changes in interest rates is limited.
+Added: In April 2016, we issued convertible notes with an aggregate principal amount of $250.0 million (see Item 8, Note 10, Financing Arrangements ).
The convertible notes bear interest at a fixed rate, so we have no financial statement impact from changes in interest rates.
However, changes in market interest rates impact the fair value of the convertible notes along with other variables such as our credit spreads and the market price and volatility of our common stock.
−Removed: In May 2019, we entered into the 2019 Credit Agreement which provides for aggregate principal borrowings of up to $400.0 million .
−Removed: As of December 31, 2019 , we had no borrowings outstanding under the 2019 Credit Agreement.
−Removed: Because the 2019 Credit Agreement bears interest at a variable rate, we are exposed to market risk relating to changes in interest rates if we borrow under the 2019 Credit Agreement.
+Added: In June 2020, we entered into the Amended Credit Agreement which provides for aggregate principal borrowings of up to $225.0 million.
+Added: As of December 31, 2020, we had $200.0 million of borrowings outstanding and $20.6 million of outstanding letters of credit under the Amended Credit Agreement.
+Added: See Item 7, Liquidity and Capital Resources, for additional information.
+Added: Because borrowings under the Amended Credit Agreement bear interest at a variable rate, we are exposed to market risk relating to changes in interest rates if we borrow under the Amended Credit Agreement.
We also have $129.4 million of lease obligations as of December 31, 2020.
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Compared sentence by sentence after normalising whitespace, quotation marks, case and digits, so re-formatting and restated figures do not read as changed language. Wording changes appear as one removal and one addition. The current filing and the prior one are authoritative.