Compute and report the Macaulay duration for each of the 12 US bonds. Report this in three 2×4 tables, where the first row corresponds to the bond number and the second to the Macaulay duration. The first table refers to the data from 2018, the second to 2019, and the third to 2020. Given these tables, how do they compare?

Consider the following Treasury bond data collected from different dates over the last two years: Number Coupon Price Yield Maturity Panel (a) Oct 5, 2018 2.75 99.74 2.88 2.88 99.11 3.07 2.88 97.00 3.23 3.00 92.47 3.40 1 2 3 4 5 7 8 9 10 11 12 Panel (b) Oct 7, 2019 1.50 100.06 1.47 100.50 1.40 100.55 1.56 104.28 2.06 Panel (b) March 20, 2020 1.13 101.57 0.31 1.13 103.25 0.46 1.50 106.20 0.85 2.00 114.17 1.42 1.50 1.63 2.25 25 10 30 2 5 10 30 25 10 30