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| year | imports | change |
| 1986 | .30 | NA |
| 1987 | .30 | 0.00% |
| 1988 | .40 | 33.33% |
| 1989 | .50 | 25.00% |
| 1990 | .70 | 40.00% |
| 1991 | .80 | 14.29% |
| 1992 | .90 | 12.50% |
| 1993 | .90 | 0.00% |
| 1994 | 1.80 | 100.00% |
| 1995 | .70 | -61.11% |
| 1996 | 1.40 | 100.00% |
| 1997 | 1.50 | 7.14% |
| 1998 | 1.90 | 26.67% |
| 1999 | 2.30 | 21.05% |
| 2000 | 2.40 | 4.35% |
| 2001 | 2.50 | 4.17% |
| 2002 | 3.20 | 28.00% |
| 2003 | 3.30 | 3.13% |
| 2004 | 3.20 | -3.03% |
| 2005 | 3.00 | -6.25% |
| 2006 | 3.10 | 3.33% |
| 2007 | 3.40 | 9.68% |
| 2008 | 3.10 | -8.82% |
| 2009 | 3.30 | 6.45% |
| 2010 | 3.40 | 3.03% |
| 2011 | 3.70 | 8.82% |
| 2012 | 3.90 | 5.41% |
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