As P&C insurers sought higher yields on their investments to offset the underwriting losses, they held corporate debt rather than government debt for a higher credit risk exposure. However, declining interest rates over some of this period resulted in P&C insurers reinvesting their interest income at lower rates.The combined ratio = 77.5% + 12.9% + 16.0% = 106.40%. In order to be profitable, the yield oninvestments has to be greater than 6.40%.