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| year | imports | change |
| 1992 | 4.10 | NA |
| 1993 | 2.70 | -34.15% |
| 1994 | 2.70 | 0.00% |
| 1995 | 2.70 | 0.00% |
| 1996 | 3.40 | 25.93% |
| 1997 | 1.80 | -47.06% |
| 1998 | 1.90 | 5.56% |
| 1999 | 2.50 | 31.58% |
| 2000 | 2.20 | -12.00% |
| 2001 | 2.30 | 4.55% |
| 2002 | 2.70 | 17.39% |
| 2003 | 2.70 | 0.00% |
| 2004 | 2.70 | 0.00% |
| 2005 | 2.90 | 7.41% |
| 2006 | 2.80 | -3.45% |
| 2007 | 5.00 | 78.57% |
| 2008 | 4.60 | -8.00% |
| 2009 | 4.30 | -6.52% |
| 2010 | 4.00 | -6.98% |
| 2011 | 4.00 | 0.00% |
| 2012 | 4.90 | 22.50% |
| 2013 | 5.00 | 2.04% |
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