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| year | imports | change |
| 1986 | .50 | NA |
| 1987 | .50 | 0.00% |
| 1988 | .60 | 20.00% |
| 1989 | .80 | 33.33% |
| 1990 | .90 | 12.50% |
| 1991 | 1.10 | 22.22% |
| 1992 | 1.20 | 9.09% |
| 1993 | .60 | -50.00% |
| 1994 | .60 | 0.00% |
| 1995 | .60 | 0.00% |
| 1996 | .60 | 0.00% |
| 1997 | 2.20 | 266.67% |
| 1998 | 2.70 | 22.73% |
| 1999 | 3.00 | 11.11% |
| 2000 | 2.90 | -3.33% |
| 2001 | 3.20 | 10.34% |
| 2002 | 3.30 | 3.13% |
| 2003 | 3.40 | 3.03% |
| 2004 | 3.90 | 14.71% |
| 2005 | 4.20 | 7.69% |
| 2006 | 4.20 | 0.00% |
| 2007 | 4.20 | 0.00% |
| 2008 | 4.00 | -4.76% |
| 2009 | 4.00 | 0.00% |
| 2010 | 3.60 | -10.00% |
| 2011 | 3.10 | -13.89% |
| 2012 | 3.20 | 3.23% |
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