A graphical plot of interest rates on government debt securities (Treasury Bills) of varying maturities can have one of three shapes; increasing, decreasing, or flat. The data below show the interest...

A graphical plot of interest rates on government debt securities (Treasury Bills) of varying maturities can have one of
three shapes; increasing, decreasing, or flat. The data below show the interest rates on the government of Ghana debt
securities (Treasury Bills) on two separate dates; 31st January 2019 and 4th May 2020.
               31 January 2019      4th May 2020
91 Day       T’Bill 14.65%       14.12%
182 Day     T’Bill 15.10%       15.31%
364 Day     T’Bill 17.38%       16.92%
Required:
i) Graph separate yield curves for the two dates.
ii) On both dates, the yield curve appears to be upward sloping. What reasons would you assign for these upward
sloping shapes of the yield curve in Ghana on these separate days?