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| year | imports | change |
| 1986 | .20 | NA |
| 1987 | .20 | 0.00% |
| 1988 | .30 | 50.00% |
| 1990 | .20 | -33.33% |
| 1992 | .40 | 100.00% |
| 1993 | 1.50 | 275.00% |
| 1994 | 1.30 | -13.33% |
| 1995 | 2.80 | 115.38% |
| 1996 | 2.80 | 0.00% |
| 1997 | 3.20 | 14.29% |
| 1998 | 5.70 | 78.12% |
| 1999 | 4.10 | -28.07% |
| 2000 | 4.10 | 0.00% |
| 2001 | 4.10 | 0.00% |
| 2002 | 5.00 | 21.95% |
| 2003 | 2.80 | -44.00% |
| 2004 | 3.20 | 14.29% |
| 2005 | 4.50 | 40.63% |
| 2006 | 7.30 | 62.22% |
| 2007 | 6.90 | -5.48% |
| 2008 | 4.70 | -31.88% |
| 2009 | 8.00 | 70.21% |
| 2010 | 9.70 | 21.25% |
| 2011 | 9.00 | -7.22% |
| 2012 | 12.00 | 33.33% |
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