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| year | imports | change |
| 1993 | .20 | NA |
| 1994 | .20 | 0.00% |
| 1995 | .70 | 250.00% |
| 1996 | .80 | 14.29% |
| 1997 | .90 | 12.50% |
| 1998 | 1.20 | 33.33% |
| 1999 | 2.10 | 75.00% |
| 2000 | 2.70 | 28.57% |
| 2001 | 1.70 | -37.04% |
| 2002 | 1.30 | -23.53% |
| 2003 | 2.40 | 84.62% |
| 2004 | 2.30 | -4.17% |
| 2005 | 2.30 | 0.00% |
| 2006 | 2.90 | 26.09% |
| 2007 | 3.80 | 31.03% |
| 2008 | 2.50 | -34.21% |
| 2009 | 2.70 | 8.00% |
| 2010 | 3.40 | 25.93% |
| 2011 | 3.60 | 5.88% |
| 2012 | 3.60 | 0.00% |
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