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| year | imports | change |
| 1980 | 4.70 | NA |
| 1981 | 4.50 | -4.26% |
| 1982 | 4.40 | -2.22% |
| 1983 | 4.60 | 4.55% |
| 1984 | 4.60 | 0.00% |
| 1985 | 7.50 | 63.04% |
| 1986 | 5.40 | -28.00% |
| 1987 | 5.30 | -1.85% |
| 1988 | 5.20 | -1.89% |
| 1989 | 5.40 | 3.85% |
| 1990 | 5.40 | 0.00% |
| 1991 | 3.10 | -42.59% |
| 1992 | 3.20 | 3.23% |
| 1993 | 1.70 | -46.88% |
| 1994 | 1.20 | -29.41% |
| 1995 | 2.00 | 66.67% |
| 1996 | 1.80 | -10.00% |
| 1997 | .80 | -55.56% |
| 1998 | .60 | -25.00% |
| 1999 | 1.70 | 183.33% |
| 2000 | 1.00 | -41.18% |
| 2001 | .80 | -20.00% |
| 2002 | 2.00 | 150.00% |
| 2003 | 1.30 | -35.00% |
| 2004 | .70 | -46.15% |
| 2005 | .80 | 14.29% |
| 2006 | 1.10 | 37.50% |
| 2007 | 3.10 | 181.82% |
| 2008 | 3.10 | 0.00% |
| 2009 | 2.70 | -12.90% |
| 2010 | 1.20 | -55.56% |
| 2011 | 1.40 | 16.67% |
| 2012 | 2.40 | 71.43% |
| 2013 | 3.40 | 41.67% |
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