FRED - Federal Surplus or Deficit [-] as Percent of Gross Domestic Product - Shares of gross domestic product: Net exports of goods and services 2.5 0.0 -2.5 5.0 Percent of GDP , Percent -7.5 -10.0 -12.5 -15.0 1985 1990 1995 2000 2005 2010 2015 2020 1975 1980 Shaded areas indicate U.S. recessions. Sources: OMB; St. Louis Fed; BEA fred.stlouisfed.org e) In the graph above, in d), is there a correlation between the two series? Explain briefly why (or why not) there may be a correlation