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| year | imports | change |
| 1992 | 2.40 | NA |
| 1993 | 11.00 | 358.33% |
| 1994 | 5.50 | -50.00% |
| 1995 | 4.30 | -21.82% |
| 1996 | 3.10 | -27.91% |
| 1997 | 2.60 | -16.13% |
| 1998 | 1.70 | -34.62% |
| 1999 | 1.20 | -29.41% |
| 2000 | .80 | -33.33% |
| 2001 | 1.50 | 87.50% |
| 2002 | 1.10 | -26.67% |
| 2003 | .80 | -27.27% |
| 2004 | 2.50 | 212.50% |
| 2005 | 1.80 | -28.00% |
| 2006 | 1.90 | 5.56% |
| 2007 | 5.90 | 210.53% |
| 2008 | 3.80 | -35.59% |
| 2009 | 2.70 | -28.95% |
| 2010 | 4.10 | 51.85% |
| 2011 | 7.80 | 90.24% |
| 2012 | 9.40 | 20.51% |
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