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| year | imports | change |
| 1986 | .20 | NA |
| 1987 | .50 | 150.00% |
| 1988 | .60 | 20.00% |
| 1989 | .60 | 0.00% |
| 1990 | .60 | 0.00% |
| 1991 | 1.00 | 66.67% |
| 1992 | 1.00 | 0.00% |
| 1993 | 1.30 | 30.00% |
| 1994 | 1.70 | 30.77% |
| 1995 | 2.50 | 47.06% |
| 1996 | 2.70 | 8.00% |
| 1997 | 2.80 | 3.70% |
| 1998 | 3.30 | 17.86% |
| 1999 | 4.40 | 33.33% |
| 2000 | 4.20 | -4.55% |
| 2001 | 4.40 | 4.76% |
| 2002 | 4.90 | 11.36% |
| 2003 | 5.40 | 10.20% |
| 2004 | 5.70 | 5.56% |
| 2005 | 5.70 | 0.00% |
| 2006 | 5.80 | 1.75% |
| 2007 | 7.40 | 27.59% |
| 2008 | 6.90 | -6.76% |
| 2009 | 7.40 | 7.25% |
| 2010 | 7.00 | -5.41% |
| 2011 | 9.20 | 31.43% |
| 2012 | 9.20 | 0.00% |
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