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| year | imports | change |
| 1986 | 7.30 | NA |
| 1987 | .40 | -94.52% |
| 1988 | .30 | -25.00% |
| 1989 | .40 | 33.33% |
| 1990 | .30 | -25.00% |
| 1991 | .60 | 100.00% |
| 1992 | 2.10 | 250.00% |
| 1993 | 3.20 | 52.38% |
| 1994 | .40 | -87.50% |
| 1995 | .50 | 25.00% |
| 1996 | .50 | 0.00% |
| 1997 | .50 | 0.00% |
| 1998 | .20 | -60.00% |
| 1999 | .40 | 100.00% |
| 2000 | .40 | 0.00% |
| 2001 | .40 | 0.00% |
| 2002 | .50 | 25.00% |
| 2003 | 5.80 | 1,060.00% |
| 2004 | 4.70 | -18.97% |
| 2005 | 1.20 | -74.47% |
| 2006 | 3.00 | 150.00% |
| 2007 | 11.00 | 266.67% |
| 2008 | .60 | -94.55% |
| 2009 | 20.00 | 3,233.33% |
| 2010 | 23.00 | 15.00% |
| 2011 | 21.00 | -8.70% |
| 2012 | 22.00 | 4.76% |
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