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| year | imports | change |
| 1980 | .06 | NA |
| 1981 | .20 | 257.14% |
| 1982 | .30 | 50.00% |
| 1983 | .30 | 0.00% |
| 1984 | .30 | 0.00% |
| 1985 | .20 | -33.33% |
| 1986 | .30 | 50.00% |
| 1987 | .30 | 0.00% |
| 1988 | .30 | 0.00% |
| 1989 | .30 | 0.00% |
| 1990 | .30 | 0.00% |
| 1991 | .40 | 33.33% |
| 1992 | .30 | -25.00% |
| 1993 | .80 | 166.67% |
| 1994 | .70 | -12.50% |
| 1995 | .60 | -14.29% |
| 1996 | .70 | 16.67% |
| 1997 | .70 | 0.00% |
| 1998 | .60 | -14.29% |
| 1999 | .20 | -66.67% |
| 2000 | 1.30 | 550.00% |
| 2001 | 3.90 | 200.00% |
| 2002 | 5.20 | 33.33% |
| 2003 | 7.40 | 42.31% |
| 2004 | 9.30 | 25.68% |
| 2005 | 9.60 | 3.23% |
| 2006 | 9.80 | 2.08% |
| 2007 | 8.30 | -15.31% |
| 2008 | 7.80 | -6.02% |
| 2009 | 7.90 | 1.28% |
| 2010 | 8.50 | 7.59% |
| 2011 | 8.60 | 1.18% |
| 2012 | 8.30 | -3.49% |
| 2013 | 8.30 | 0.00% |
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