|
| year | production | consumption |
| 1984 | 2.44 | 3.68 |
| 1985 | 2.86 | 3.72 |
| 1986 | 2.03 | 3.56 |
| 1987 | 2.38 | 3.69 |
| 1988 | 1.43 | 5.07 |
| 1989 | 1.27 | 3.72 |
| 1990 | 1.47 | 4.19 |
| 1991 | 1.33 | 5.24 |
| 1992 | .57 | 5.17 |
| 1993 | .64 | 5.41 |
| 1994 | 1.08 | 5.56 |
| 1995 | 1.91 | 5.91 |
| 1996 | .64 | 5.04 |
| 1997 | 1.40 | 4.23 |
| 1998 | .92 | 4.64 |
| 1999 | .57 | 4.76 |
| 2000 | 1.17 | 5.43 |
| 2001 | .13 | 4.54 |
| 2002 | .86 | 5.37 |
| 2003 | 1.58 | 5.62 |
| 2004 | 1.81 | 5.61 |
| 2005 | 3.44 | 6.99 |
| 2006 | 1.63 | 5.78 |
| 2007 | 2.26 | 5.76 |
| 2008 | 3.11 | 5.45 |
| 2009 | 2.89 | 5.81 |
| 2010 | 2.76 | 6.01 |
|
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