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| year | imports | change |
| 1986 | 1.70 | NA |
| 1987 | 1.70 | 0.00% |
| 1988 | 1.70 | 0.00% |
| 1989 | 1.80 | 5.88% |
| 1990 | 1.70 | -5.56% |
| 1991 | 1.10 | -35.29% |
| 1992 | .90 | -18.18% |
| 1993 | .90 | 0.00% |
| 1994 | .90 | 0.00% |
| 1995 | .90 | 0.00% |
| 1996 | .90 | 0.00% |
| 1997 | .90 | 0.00% |
| 1998 | .90 | 0.00% |
| 1999 | .90 | 0.00% |
| 2000 | 1.50 | 66.67% |
| 2001 | 1.50 | 0.00% |
| 2002 | 1.50 | 0.00% |
| 2003 | 1.50 | 0.00% |
| 2004 | 1.50 | 0.00% |
| 2005 | 1.70 | 13.33% |
| 2006 | 1.60 | -5.88% |
| 2007 | 1.90 | 18.75% |
| 2008 | 2.00 | 5.26% |
| 2009 | 2.20 | 10.00% |
| 2010 | 2.10 | -4.55% |
| 2011 | 2.10 | 0.00% |
| 2012 | 2.10 | 0.00% |
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