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| year | imports | change |
| 1986 | 2.20 | NA |
| 1987 | 3.00 | 36.36% |
| 1988 | 5.20 | 73.33% |
| 1989 | 4.70 | -9.62% |
| 1990 | 2.50 | -46.81% |
| 1991 | 2.90 | 16.00% |
| 1992 | 1.60 | -44.83% |
| 1993 | 1.50 | -6.25% |
| 1994 | 1.50 | 0.00% |
| 1995 | 1.50 | 0.00% |
| 1996 | 1.60 | 6.67% |
| 1997 | 1.60 | 0.00% |
| 1998 | 1.60 | 0.00% |
| 1999 | 2.20 | 37.50% |
| 2000 | 3.00 | 36.36% |
| 2001 | 2.20 | -26.67% |
| 2002 | 3.20 | 45.45% |
| 2003 | 4.50 | 40.63% |
| 2004 | 4.80 | 6.67% |
| 2005 | 5.00 | 4.17% |
| 2006 | 4.00 | -20.00% |
| 2007 | 3.90 | -2.50% |
| 2008 | 2.80 | -28.21% |
| 2009 | 2.80 | 0.00% |
| 2010 | 4.00 | 42.86% |
| 2011 | 2.70 | -32.50% |
| 2012 | 2.90 | 7.41% |
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