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| year | imports | change |
| 1986 | 3.20 | NA |
| 1987 | 1.10 | -65.63% |
| 1988 | .70 | -36.36% |
| 1989 | .70 | 0.00% |
| 1990 | 2.60 | 271.43% |
| 1991 | 3.10 | 19.23% |
| 1992 | 2.80 | -9.68% |
| 1993 | 2.80 | 0.00% |
| 1994 | 2.90 | 3.57% |
| 1995 | 2.90 | 0.00% |
| 1996 | 2.80 | -3.45% |
| 1997 | 2.90 | 3.57% |
| 1998 | 2.90 | 0.00% |
| 1999 | 2.90 | 0.00% |
| 2000 | 2.20 | -24.14% |
| 2001 | 2.10 | -4.55% |
| 2002 | 2.10 | 0.00% |
| 2003 | 2.30 | 9.52% |
| 2004 | 2.70 | 17.39% |
| 2005 | 2.80 | 3.70% |
| 2006 | 2.90 | 3.57% |
| 2007 | 2.90 | 0.00% |
| 2008 | 2.90 | 0.00% |
| 2009 | 2.90 | 0.00% |
| 2010 | 4.60 | 58.62% |
| 2011 | 4.60 | 0.00% |
| 2012 | 4.60 | 0.00% |
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