|
| year | imports | change |
| 1980 | 52.91 | NA |
| 1981 | 84.88 | 60.42 % |
| 1982 | 99.21 | 16.88 % |
| 1983 | 343.92 | 246.67 % |
| 1984 | 265.66 | -22.76 % |
| 1985 | 520.29 | 95.85 % |
| 1986 | 928.15 | 78.39 % |
| 1987 | 1,146.40 | 23.52 % |
| 1988 | 1,204.83 | 5.10 % |
| 1989 | 1,464.97 | 21.59 % |
| 1990 | 1,378.99 | -5.87 % |
| 1991 | 1,568.59 | 13.75 % |
| 1992 | 1,367.97 | -12.79 % |
| 1993 | 1,462.77 | 6.93 % |
| 1994 | 1,672.21 | 14.32 % |
| 1995 | 2,128.56 | 27.29 % |
| 1996 | 3,151.51 | 48.06 % |
| 1997 | 3,120.64 | -0.98 % |
| 1998 | 3,694.95 | 18.40 % |
| 1999 | 3,584.72 | -2.98 % |
| 2000 | 4,367.36 | 21.83 % |
| 2001 | 5,660.37 | 29.61 % |
| 2002 | 5,612.97 | -0.84 % |
| 2003 | 5,390.30 | -3.97 % |
| 2004 | 5,132.36 | -4.79 % |
| 2005 | 5,429.99 | 5.80 % |
| 2006 | 5,402.43 | -0.51 % |
| 2007 | 5,532.50 | 2.41 % |
| 2008 | 4,918.51 | -11.10 % |
| 2009 | 4,518.37 | -8.14 % |
| 2010 | 4,655.06 | 3.03 % |
| 2011 | 5,357.23 | 15.08 % |
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