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| year | imports | change |
| 1980 | .70 | NA |
| 1981 | .40 | -42.86% |
| 1982 | .80 | 100.00% |
| 1983 | 1.90 | 137.50% |
| 1984 | 2.60 | 36.84% |
| 1985 | .90 | -65.38% |
| 1986 | 1.60 | 77.78% |
| 1987 | 1.00 | -37.50% |
| 1988 | .70 | -30.00% |
| 1989 | 1.00 | 42.86% |
| 1990 | 1.30 | 30.00% |
| 1991 | 1.50 | 15.38% |
| 1992 | 1.00 | -33.33% |
| 1993 | 1.10 | 10.00% |
| 1994 | .80 | -27.27% |
| 1995 | 1.40 | 75.00% |
| 1996 | 2.70 | 92.86% |
| 1997 | 3.00 | 11.11% |
| 1998 | 2.50 | -16.67% |
| 1999 | 1.80 | -28.00% |
| 2000 | 1.70 | -5.56% |
| 2001 | 3.60 | 111.76% |
| 2002 | 4.60 | 27.78% |
| 2003 | 4.20 | -8.70% |
| 2004 | 4.90 | 16.67% |
| 2005 | 5.60 | 14.29% |
| 2006 | 6.10 | 8.93% |
| 2007 | 6.40 | 4.92% |
| 2008 | 7.60 | 18.75% |
| 2009 | 7.60 | 0.00% |
| 2010 | 8.50 | 11.84% |
| 2011 | 7.20 | -15.29% |
| 2012 | 6.00 | -16.67% |
| 2013 | 5.80 | -3.33% |
| 2014 | 9.50 | 63.79% |
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