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| year | imports | change |
| 1986 | 3.40 | NA |
| 1987 | 3.40 | 0.00% |
| 1988 | 3.40 | 0.00% |
| 1989 | 3.20 | -5.88% |
| 1990 | 4.60 | 43.75% |
| 1991 | 3.90 | -15.22% |
| 1992 | 4.40 | 12.82% |
| 1993 | 5.30 | 20.45% |
| 1994 | 5.90 | 11.32% |
| 1995 | 6.80 | 15.25% |
| 1996 | 6.80 | 0.00% |
| 1997 | 5.60 | -17.65% |
| 1998 | 5.60 | 0.00% |
| 1999 | 6.00 | 7.14% |
| 2000 | 5.80 | -3.33% |
| 2001 | 11.00 | 89.66% |
| 2002 | 8.70 | -20.91% |
| 2003 | 8.80 | 1.15% |
| 2004 | 7.60 | -13.64% |
| 2005 | 7.10 | -6.58% |
| 2006 | 6.50 | -8.45% |
| 2007 | 5.30 | -18.46% |
| 2008 | 3.00 | -43.40% |
| 2009 | 1.20 | -60.00% |
| 2010 | .70 | -41.67% |
| 2011 | .40 | -42.86% |
| 2012 | .60 | 50.00% |
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