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| year | imports | change |
| 1986 | 2.50 | NA |
| 1987 | 2.50 | 0.00% |
| 1988 | 1.10 | -56.00% |
| 1989 | 2.50 | 127.27% |
| 1990 | 1.10 | -56.00% |
| 1991 | 1.00 | -9.09% |
| 1992 | 1.70 | 70.00% |
| 1993 | .90 | -47.06% |
| 1994 | 1.30 | 44.44% |
| 1995 | 1.30 | 0.00% |
| 1996 | 1.30 | 0.00% |
| 1997 | 3.10 | 138.46% |
| 1998 | 2.70 | -12.90% |
| 1999 | 4.10 | 51.85% |
| 2000 | 3.40 | -17.07% |
| 2001 | 3.40 | 0.00% |
| 2002 | 2.80 | -17.65% |
| 2003 | 2.10 | -25.00% |
| 2004 | 1.90 | -9.52% |
| 2005 | 2.70 | 42.11% |
| 2006 | 7.50 | 177.78% |
| 2007 | 4.40 | -41.33% |
| 2008 | 3.20 | -27.27% |
| 2009 | 6.40 | 100.00% |
| 2010 | 9.10 | 42.19% |
| 2011 | 8.50 | -6.59% |
| 2012 | 5.50 | -35.29% |
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