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| year | imports | change |
| 1986 | 5.10 | NA |
| 1987 | 5.10 | 0.00% |
| 1988 | 6.10 | 19.61% |
| 1989 | 6.10 | 0.00% |
| 1990 | 6.10 | 0.00% |
| 1991 | 6.10 | 0.00% |
| 1992 | 7.10 | 16.39% |
| 1993 | 5.90 | -16.90% |
| 1994 | 5.40 | -8.47% |
| 1995 | 5.70 | 5.56% |
| 1996 | 5.60 | -1.75% |
| 1997 | 5.50 | -1.79% |
| 1998 | 5.00 | -9.09% |
| 1999 | 5.30 | 6.00% |
| 2000 | 5.40 | 1.89% |
| 2001 | 1.60 | -70.37% |
| 2002 | 1.60 | 0.00% |
| 2003 | 1.70 | 6.25% |
| 2004 | 1.50 | -11.76% |
| 2005 | 1.30 | -13.33% |
| 2006 | 1.00 | -23.08% |
| 2007 | 1.20 | 20.00% |
| 2008 | 1.20 | 0.00% |
| 2009 | .90 | -25.00% |
| 2010 | .90 | 0.00% |
| 2011 | .90 | 0.00% |
| 2012 | .90 | 0.00% |
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