| Year |
Exports |
Imports |
Balance |
| 1970 |
43.8 |
40.4 |
3.4 |
| 1971 |
44.7 |
46.2 |
-1.5 |
| 1972 |
50.5 |
56.4 |
-5.9 |
| 1973 |
72.5 |
70.5 |
2.0 |
| 1974 |
100.0 |
102.6 |
-2.5 |
| 1975 |
109.3 |
98.5 |
10.8 |
| 1976 |
117.0 |
123.5 |
-6.5 |
| 1977 |
123.2 |
151.0 |
-27.8 |
| 1978 |
145.9 |
174.8 |
-28.8 |
| 1979 |
186.5 |
209.5 |
-22.9 |
| 1980 |
225.7 |
245.3 |
-19.5 |
| 1981 |
238.7 |
261.0 |
-22.3 |
| 1982 |
216.4 |
244.0 |
-27.5 |
| 1983 |
205.6 |
258.0 |
-52.4 |
| 1983 |
205.6 |
258.0 |
-52.4 |
| 1984 |
224.0 |
330.7 |
-106.7 |
| 1985 |
218.8 |
336.5 |
-117.7 |
| 1986 |
227.2 |
365.4 |
-138.3 |
| 1987 |
254.1 |
406.2 |
-152.1 |
| 1988 |
322.4 |
441.0 |
-118.5 |
| 1989 |
363.8 |
473.2 |
-109.4 |
| 1990 |
393.6 |
495.3 |
-101.7 |
| 1991 |
421.7 |
488.5 |
-66.7 |
| 1992 |
448.2 |
532.7 |
-84.5 |
| 1993 |
465.1 |
580.7 |
-115.6 |
| 1994 |
512.6 |
663.3 |
-150.6 |
| 1995 |
584.7 |
743.4 |
-158.7 |
| 1996 |
625.1 |
795.3 |
-170.2 |
| 1997 |
689.2 |
870.7 |
-181.5 |
| 1998 |
682.1 |
911.9 |
-229.8 |
Source: US Census Bureau, http://www.census.gov/prod/99pubs/99statab/sec28.pdf