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| year | imports | change |
| 1986 | .70 | NA |
| 1988 | .90 | 28.57% |
| 1990 | .70 | -22.22% |
| 1991 | .70 | 0.00% |
| 1992 | .90 | 28.57% |
| 1993 | 1.50 | 66.67% |
| 1994 | .20 | -86.67% |
| 1995 | .20 | 0.00% |
| 1996 | .20 | 0.00% |
| 1997 | 1.20 | 500.00% |
| 1998 | 1.50 | 25.00% |
| 1999 | 1.20 | -20.00% |
| 2000 | 1.30 | 8.33% |
| 2001 | 2.10 | 61.54% |
| 2002 | .50 | -76.19% |
| 2003 | 1.20 | 140.00% |
| 2004 | .90 | -25.00% |
| 2005 | .90 | 0.00% |
| 2006 | 2.80 | 211.11% |
| 2007 | 3.40 | 21.43% |
| 2008 | 4.20 | 23.53% |
| 2009 | 2.30 | -45.24% |
| 2010 | 3.50 | 52.17% |
| 2011 | 3.80 | 8.57% |
| 2012 | 4.00 | 5.26% |
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