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| year | imports | change |
| 1980 | .50 | NA |
| 1981 | .60 | 20.00 % |
| 1982 | 1.10 | 83.33 % |
| 1983 | 2.10 | 90.91 % |
| 1984 | 3.10 | 47.62 % |
| 1985 | 3.30 | 6.45 % |
| 1986 | 4.40 | 33.33 % |
| 1987 | 5.20 | 18.18 % |
| 1988 | 7.00 | 34.62 % |
| 1989 | 7.80 | 11.43 % |
| 1990 | 9.60 | 23.08 % |
| 1991 | 7.00 | -27.08 % |
| 1992 | 4.40 | -37.14 % |
| 1993 | 3.00 | -31.82 % |
| 1994 | 1.80 | -40.00 % |
| 1995 | .80 | -55.56 % |
| 1996 | 2.20 | 175.00 % |
| 1997 | 1.00 | -54.55 % |
| 1998 | 1.20 | 20.00 % |
| 1999 | 1.20 | 0.00 % |
| 2000 | .80 | -33.33 % |
| 2001 | .70 | -12.50 % |
| 2002 | .40 | -42.86 % |
| 2003 | 1.00 | 150.00 % |
| 2004 | 2.60 | 160.00 % |
| 2005 | 2.30 | -11.54 % |
| 2006 | 1.00 | -56.52 % |
| 2007 | 1.30 | 30.00 % |
| 2008 | .90 | -30.77 % |
| 2009 | .70 | -22.22 % |
| 2010 | .80 | 14.29 % |
| 2011 | 3.40 | 325.00 % |
| 2012 | 3.90 | 14.71 % |
| 2013 | 2.70 | -30.77 % |
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