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| year | imports | change |
| 1980 | 2.90 | NA |
| 1981 | 3.00 | 3.45% |
| 1982 | 3.50 | 16.67% |
| 1983 | 3.00 | -14.29% |
| 1984 | 3.00 | 0.00% |
| 1985 | 2.60 | -13.33% |
| 1986 | 2.40 | -7.69% |
| 1987 | .90 | -62.50% |
| 1988 | .80 | -11.11% |
| 1989 | .90 | 12.50% |
| 1990 | 1.40 | 55.56% |
| 1991 | 1.40 | 0.00% |
| 1992 | 1.80 | 28.57% |
| 1993 | 1.90 | 5.56% |
| 1994 | 1.80 | -5.26% |
| 1995 | 1.80 | 0.00% |
| 1996 | 2.30 | 27.78% |
| 1997 | 3.40 | 47.83% |
| 1998 | 3.90 | 14.71% |
| 1999 | 4.30 | 10.26% |
| 2000 | 5.10 | 18.60% |
| 2001 | 4.10 | -19.61% |
| 2002 | 4.00 | -2.44% |
| 2003 | 3.20 | -20.00% |
| 2004 | 2.00 | -37.50% |
| 2005 | 3.00 | 50.00% |
| 2006 | 4.20 | 40.00% |
| 2007 | 3.00 | -28.57% |
| 2008 | 1.70 | -43.33% |
| 2009 | 2.20 | 29.41% |
| 2010 | 1.70 | -22.73% |
| 2011 | 1.60 | -5.88% |
| 2012 | 1.20 | -25.00% |
| 2013 | 1.90 | 58.33% |
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