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| year | imports | change |
| 1987 | .20 | NA |
| 1988 | .30 | 50.00% |
| 1989 | .20 | -33.33% |
| 1990 | .00 | -100.00% |
| 1991 | .10 | NA |
| 1992 | .40 | 300.00% |
| 1993 | 3.30 | 725.00% |
| 1994 | 4.60 | 39.39% |
| 1995 | .90 | -80.43% |
| 1996 | 1.70 | 88.89% |
| 1997 | 1.30 | -23.53% |
| 1998 | .70 | -46.15% |
| 1999 | 1.50 | 114.29% |
| 2000 | 1.20 | -20.00% |
| 2001 | 1.10 | -8.33% |
| 2002 | 1.50 | 36.36% |
| 2003 | .90 | -40.00% |
| 2006 | .60 | -33.33% |
| 2007 | 1.30 | 116.67% |
| 2008 | .10 | -92.31% |
| 2009 | 1.00 | 900.00% |
| 2010 | 2.00 | 100.00% |
| 2011 | 2.30 | 15.00% |
| 2012 | 1.80 | -21.74% |
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