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| year | imports | change |
| 1986 | 3.90 | NA |
| 1987 | 7.40 | 89.74% |
| 1988 | 5.90 | -20.27% |
| 1989 | 5.40 | -8.47% |
| 1990 | 4.30 | -20.37% |
| 1991 | 5.90 | 37.21% |
| 1992 | 2.00 | -66.10% |
| 1993 | 2.20 | 10.00% |
| 1994 | 1.30 | -40.91% |
| 1995 | 3.60 | 176.92% |
| 1996 | 3.10 | -13.89% |
| 1997 | 2.00 | -35.48% |
| 1998 | .40 | -80.00% |
| 1999 | .30 | -25.00% |
| 2000 | .60 | 100.00% |
| 2001 | .30 | -50.00% |
| 2002 | .50 | 66.67% |
| 2003 | .80 | 60.00% |
| 2004 | .30 | -62.50% |
| 2005 | .60 | 100.00% |
| 2006 | 2.70 | 350.00% |
| 2007 | 3.20 | 18.52% |
| 2008 | 4.20 | 31.25% |
| 2009 | 1.50 | -64.29% |
| 2010 | 1.00 | -33.33% |
| 2011 | 3.70 | 270.00% |
| 2012 | 3.90 | 5.41% |
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