16.3 The data file Government Spending France contains the time series of general government spending as a percent of the GDP for France. The dataset covers the period 2002:Q1 up to 2019:Q4, for a total of 72 quarters.

a. Plot the time series, and discuss its features. Is a seasonal adjustment warranted?

b. Use the seasonal-index method to seasonally adjust this series. Graph the seasonally adjusted series, and discuss its features.