Table 6E.4 shows U.S. petroleum imports as a percentage of the totals, and Persian Gulf imports as a percentage of all imports by year since 1973 (source: U.S. Department of Energy Web site, www.eia.doe.gov/). Construct and interpret either a digidot plot or a separate stem-and-leaf and time series plot for each column of data.

Table 6E.4

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Total Petroleum Imports Petroleum Imports (thousand barrels per day) 6256 Petroleum Imports from Persian Gulf as Percent of Total Petroleum Imports as Percent of Petroleum Year Products Supplied 36.1 1973 13.5 1974 36.7 17.0 6112 1975 6055 37.1 19.2 1976 25.1 7313 41.8 1977 8807 47.7 27.8 44.3 1978 8363 26.5 8456 1979 45.6 24.4 40.5 21.9 1980 6909 5996 1981 37.3 20.3 1982 5113 33.4 13.6 1983 5051 33.1 8.7 5437 1984 34.5 9.3 32.2 1985 5067 6.1 6224 38.2 1986 14.6 6678 1987 40.0 16.1 1988 7402 20.8 42.8 1989 8061 46.5 23.0 1990 24.5 8018 47.1 1991 7627 45.6 24.1 1992 7888 46.3 22.5 1993 8620 50.0 20.6 50.7 1994 8996 19.2 1995 8835 49.8 17.8 51.7 1996 9478 16.9 17.2 1997 10,162 54.5 1998 10,708 56.6 19.9 55.5 1999 10,852 22.7 2000 11,459 58.1 21.7 60.4 2001 11,871 23.2 2002 19.6 11,530 58.3 2003 12,264 61.2 20.3 63.4 2004 13,145 18.9 2005 13,714 65.9 17.0 2006 13,707 66.3 16.1 16.1 2007 13,468 65.1 2008 12,915 66.2 18.4