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| year | imports | change |
| 1986 | .60 | NA |
| 1987 | .70 | 16.67% |
| 1988 | .70 | 0.00% |
| 1989 | .40 | -42.86% |
| 1990 | .40 | 0.00% |
| 1991 | .50 | 25.00% |
| 1992 | .80 | 60.00% |
| 1993 | 1.20 | 50.00% |
| 1994 | .30 | -75.00% |
| 1995 | .40 | 33.33% |
| 1996 | 2.90 | 625.00% |
| 1997 | 2.60 | -10.34% |
| 1998 | 2.80 | 7.69% |
| 1999 | 2.70 | -3.57% |
| 2000 | 1.80 | -33.33% |
| 2001 | 1.40 | -22.22% |
| 2002 | .80 | -42.86% |
| 2003 | .40 | -50.00% |
| 2004 | 1.00 | 150.00% |
| 2005 | 1.00 | 0.00% |
| 2006 | 1.30 | 30.00% |
| 2007 | 1.30 | 0.00% |
| 2008 | 2.30 | 76.92% |
| 2009 | 3.80 | 65.22% |
| 2010 | 4.90 | 28.95% |
| 2011 | 4.40 | -10.20% |
| 2012 | 4.40 | 0.00% |
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