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| year | imports | change |
| 1986 | .60 | NA |
| 1987 | 1.30 | 116.67% |
| 1988 | .60 | -53.85% |
| 1989 | .50 | -16.67% |
| 1990 | .60 | 20.00% |
| 1991 | 1.50 | 150.00% |
| 1992 | 1.50 | 0.00% |
| 1993 | 1.60 | 6.67% |
| 1994 | 1.60 | 0.00% |
| 1995 | 1.60 | 0.00% |
| 1996 | 1.70 | 6.25% |
| 1997 | 1.70 | 0.00% |
| 1998 | 1.70 | 0.00% |
| 1999 | 1.70 | 0.00% |
| 2000 | 1.70 | 0.00% |
| 2001 | 1.70 | 0.00% |
| 2002 | 1.70 | 0.00% |
| 2003 | 1.80 | 5.88% |
| 2004 | 1.80 | 0.00% |
| 2005 | 1.80 | 0.00% |
| 2006 | 3.50 | 94.44% |
| 2007 | 3.70 | 5.71% |
| 2008 | 5.30 | 43.24% |
| 2009 | 5.50 | 3.77% |
| 2010 | 5.50 | 0.00% |
| 2011 | 5.50 | 0.00% |
| 2012 | 5.50 | 0.00% |
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