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| year | imports | change |
| 1986 | 1.40 | NA |
| 1987 | 1.20 | -14.29% |
| 1988 | 1.20 | 0.00% |
| 1989 | 1.30 | 8.33% |
| 1990 | 1.60 | 23.08% |
| 1991 | 1.60 | 0.00% |
| 1992 | 1.50 | -6.25% |
| 1993 | 1.50 | 0.00% |
| 1994 | 1.50 | 0.00% |
| 1995 | 1.50 | 0.00% |
| 1996 | 1.50 | 0.00% |
| 1997 | 1.50 | 0.00% |
| 1998 | 1.40 | -6.67% |
| 1999 | 1.40 | 0.00% |
| 2000 | 1.40 | 0.00% |
| 2001 | 1.90 | 35.71% |
| 2002 | 2.50 | 31.58% |
| 2003 | 2.50 | 0.00% |
| 2004 | 2.20 | -12.00% |
| 2005 | 1.70 | -22.73% |
| 2006 | 1.90 | 11.76% |
| 2007 | 1.80 | -5.26% |
| 2008 | 1.50 | -16.67% |
| 2009 | 1.00 | -33.33% |
| 2010 | .90 | -10.00% |
| 2011 | 1.00 | 11.11% |
| 2012 | 1.00 | 0.00% |
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