2.20 Table below gives the average amount of refined oil products imported and exported per day over the years 1990–2000 (U.S. Census Bureau, Statistical Abstract of the United States, 2001). The averages are reported in 1,000 barrels (bbl) per day, where a barrel contains

42 gallons.
a Make time series plots for the import and export of oil products. Comment on any trends observed.
b Make a scatterplot of export versus import amounts. Comment on any trends observed.

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Year Import Export 1990 2123 748 1991 1844 885 1992 1805 861 1993 1833 904 1994 1933 843 1995 1605 855 1996 1971 871 1997 1936 896 1998 2002 835 1999 2122 822 2000 2146 974