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| year | imports | change |
| 1980 | .30 | NA |
| 1981 | .20 | -33.33% |
| 1982 | .30 | 50.00% |
| 1983 | .40 | 33.33% |
| 1984 | .80 | 100.00% |
| 1985 | 1.10 | 37.50% |
| 1986 | 1.20 | 9.09% |
| 1987 | 1.30 | 8.33% |
| 1988 | 1.50 | 15.38% |
| 1989 | 1.60 | 6.67% |
| 1990 | 1.90 | 18.75% |
| 1991 | 3.10 | 63.16% |
| 1992 | 5.00 | 61.29% |
| 1993 | 4.50 | -10.00% |
| 1994 | 1.60 | -64.44% |
| 1995 | .80 | -50.00% |
| 1996 | .10 | -87.50% |
| 1997 | .09 | -11.00% |
| 1998 | .10 | 12.36% |
| 1999 | .40 | 300.00% |
| 2000 | 1.50 | 275.00% |
| 2001 | 1.80 | 20.00% |
| 2002 | 2.30 | 27.78% |
| 2003 | 3.00 | 30.43% |
| 2004 | 3.40 | 13.33% |
| 2005 | 5.00 | 47.06% |
| 2006 | 5.40 | 8.00% |
| 2007 | 4.30 | -20.37% |
| 2008 | 3.80 | -11.63% |
| 2009 | 6.00 | 57.89% |
| 2010 | 5.50 | -8.33% |
| 2011 | 6.60 | 20.00% |
| 2012 | 6.90 | 4.55% |
| 2013 | 7.40 | 7.25% |
| 2014 | 6.70 | -9.46% |
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