A company has issued 3- and 5-year bonds with a coupon of $4 \%$ per annum payable annually. The yields on the bonds (expressed with continuous compounding) are $4.5 \%$ and $4.75 \%$, respectively. Risk-free rates are $3.5 \%$ with continuous compounding for all maturities. The recovery rate is $40 \%$. Defaults can take place halfway through each year. The risk-neutral default rates per year are $Q_1$ for years 1 to 3 and $Q_2$ for years 4 and 5 . Estimate $Q_1$ and $Q_2$.