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| year | imports | change |
| 1986 | 2.00 | NA |
| 1987 | 2.00 | 0.00% |
| 1988 | 2.00 | 0.00% |
| 1989 | 2.00 | 0.00% |
| 1990 | 1.90 | -5.00% |
| 1991 | .30 | -84.21% |
| 1992 | .40 | 33.33% |
| 1993 | .50 | 25.00% |
| 1994 | 2.10 | 320.00% |
| 1995 | 2.10 | 0.00% |
| 1996 | 2.50 | 19.05% |
| 1997 | 3.40 | 36.00% |
| 1998 | 4.20 | 23.53% |
| 1999 | 3.60 | -14.29% |
| 2000 | 3.30 | -8.33% |
| 2001 | 3.10 | -6.06% |
| 2002 | 3.20 | 3.23% |
| 2003 | 2.90 | -9.38% |
| 2004 | 4.00 | 37.93% |
| 2005 | 4.40 | 10.00% |
| 2006 | 4.30 | -2.27% |
| 2007 | 5.90 | 37.21% |
| 2008 | 4.80 | -18.64% |
| 2009 | 3.90 | -18.75% |
| 2010 | 3.80 | -2.56% |
| 2011 | 4.80 | 26.32% |
| 2012 | 6.40 | 33.33% |
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