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| year | imports | change |
| 1986 | .40 | NA |
| 1987 | .40 | 0.00% |
| 1988 | .40 | 0.00% |
| 1989 | .40 | 0.00% |
| 1990 | .30 | -25.00% |
| 1991 | .40 | 33.33% |
| 1992 | .50 | 25.00% |
| 1993 | .50 | 0.00% |
| 1994 | .50 | 0.00% |
| 1995 | .50 | 0.00% |
| 1996 | .60 | 20.00% |
| 1997 | .80 | 33.33% |
| 1998 | .90 | 12.50% |
| 1999 | .90 | 0.00% |
| 2000 | 1.00 | 11.11% |
| 2001 | 1.10 | 10.00% |
| 2002 | 1.20 | 9.09% |
| 2003 | 1.20 | 0.00% |
| 2004 | 1.20 | 0.00% |
| 2005 | 1.30 | 8.33% |
| 2006 | 1.50 | 15.38% |
| 2007 | 1.40 | -6.67% |
| 2008 | 1.50 | 7.14% |
| 2009 | 2.70 | 80.00% |
| 2010 | 3.10 | 14.81% |
| 2011 | 2.70 | -12.90% |
| 2012 | 2.70 | 0.00% |
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