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| year | imports | change |
| 1986 | 1.10 | NA |
| 1987 | 1.30 | 18.18% |
| 1988 | .90 | -30.77% |
| 1989 | 1.20 | 33.33% |
| 1990 | 1.20 | 0.00% |
| 1991 | 1.30 | 8.33% |
| 1992 | 1.70 | 30.77% |
| 1993 | 2.60 | 52.94% |
| 1994 | 3.90 | 50.00% |
| 1995 | 3.00 | -23.08% |
| 1996 | 3.70 | 23.33% |
| 1997 | 3.40 | -8.11% |
| 1998 | 4.30 | 26.47% |
| 1999 | 4.30 | 0.00% |
| 2000 | 3.90 | -9.30% |
| 2001 | 3.70 | -5.13% |
| 2002 | 3.60 | -2.70% |
| 2003 | 3.60 | 0.00% |
| 2004 | 3.10 | -13.89% |
| 2005 | 3.40 | 9.68% |
| 2006 | 4.20 | 23.53% |
| 2007 | 4.40 | 4.76% |
| 2008 | 5.00 | 13.64% |
| 2009 | 5.20 | 4.00% |
| 2010 | 6.40 | 23.08% |
| 2011 | 7.50 | 17.19% |
| 2012 | 7.40 | -1.33% |
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