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| year | imports | change |
| 1986 | .30 | NA |
| 1987 | .30 | 0.00% |
| 1988 | .30 | 0.00% |
| 1989 | .30 | 0.00% |
| 1990 | .20 | -33.33% |
| 1991 | .30 | 50.00% |
| 1992 | .30 | 0.00% |
| 1993 | .70 | 133.33% |
| 1994 | .80 | 14.29% |
| 1995 | .80 | 0.00% |
| 1996 | 1.40 | 75.00% |
| 1997 | 1.50 | 7.14% |
| 1998 | 1.40 | -6.67% |
| 1999 | 1.60 | 14.29% |
| 2000 | 1.60 | 0.00% |
| 2001 | 1.90 | 18.75% |
| 2002 | 2.00 | 5.26% |
| 2003 | 2.30 | 15.00% |
| 2004 | 2.40 | 4.35% |
| 2005 | 2.70 | 12.50% |
| 2006 | 3.30 | 22.22% |
| 2007 | 7.70 | 133.33% |
| 2008 | 9.60 | 24.68% |
| 2009 | 12.00 | 25.00% |
| 2010 | 13.00 | 8.33% |
| 2011 | 12.00 | -7.69% |
| 2012 | 15.00 | 25.00% |
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