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| year | imports | change |
| 1992 | .90 | NA |
| 1993 | .30 | -66.67% |
| 1994 | .50 | 66.67% |
| 1995 | .90 | 80.00% |
| 1996 | .80 | -11.11% |
| 1997 | 1.60 | 100.00% |
| 1998 | .90 | -43.75% |
| 1999 | 1.60 | 77.78% |
| 2000 | .90 | -43.75% |
| 2001 | 1.20 | 33.33% |
| 2002 | 2.40 | 100.00% |
| 2003 | 2.50 | 4.17% |
| 2004 | 2.40 | -4.00% |
| 2005 | 2.10 | -12.50% |
| 2006 | 1.80 | -14.29% |
| 2007 | .50 | -72.22% |
| 2008 | .20 | -60.00% |
| 2009 | .10 | -50.00% |
| 2010 | .10 | 0.00% |
| 2011 | .10 | 0.00% |
| 2012 | .10 | 0.00% |
| 2013 | .10 | 0.00% |
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