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| year | imports | change |
| 1993 | .80 | NA |
| 1994 | 1.10 | 37.50% |
| 1995 | 1.50 | 36.36% |
| 1996 | 2.50 | 66.67% |
| 1997 | 2.80 | 12.00% |
| 1998 | 3.10 | 10.71% |
| 1999 | 3.80 | 22.58% |
| 2000 | 4.10 | 7.89% |
| 2001 | 3.70 | -9.76% |
| 2002 | 3.80 | 2.70% |
| 2003 | 3.60 | -5.26% |
| 2004 | 4.00 | 11.11% |
| 2005 | 3.70 | -7.50% |
| 2006 | 3.80 | 2.70% |
| 2007 | 2.90 | -23.68% |
| 2008 | 2.50 | -13.79% |
| 2009 | 2.50 | 0.00% |
| 2010 | 2.20 | -12.00% |
| 2011 | 2.40 | 9.09% |
| 2012 | 2.50 | 4.17% |
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