Total......... USD 15 USD - USD 9 USD - USD 24 USD 1 Indicates the length of time that individual securities have been in a continuous unrealized loss position. Corporate Bonds The unrealized losses on our investments in corporate bonds relate to changes in interest rates and credit-related yield spreads since time of purchase. We do not intend to sell the investments, and it is not likely that we will be required to sell the investments before recovery of their amortized cost basis. In addition, we did not expect credit-related losses on these investments as of March 31, 2021. Mortgage-Backed Debt Securities The unrealized losses on our investments in U.S. government agency mortgage-backed securities relate to changes in interest rates and credit-related yield spreads since time of purchase. We do not intend to sell the investments, and it is not likely that we will be required to sell the investments before recovery of their amortized cost basis. In addition, we did n