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Loading...
| year | production | consumption |
| 1986 | 4.70 | 4.50 |
| 1987 | 4.30 | 4.30 |
| 1988 | 3.60 | 5.60 |
| 1989 | 3.90 | 4.90 |
| 1990 | 4.10 | 4.50 |
| 1991 | 3.90 | 5.50 |
| 1992 | 3.90 | 4.80 |
| 1993 | 3.90 | 4.90 |
| 1994 | 4.00 | 5.20 |
| 1995 | 2.40 | 3.40 |
| 1996 | 2.00 | 3.10 |
| 1997 | 3.60 | 5.20 |
| 1998 | 3.60 | 5.70 |
| 1999 | 3.70 | 6.30 |
| 2000 | 3.60 | 7.60 |
| 2001 | 1.30 | 4.10 |
| 2002 | 1.40 | 4.10 |
| 2003 | .80 | 3.40 |
| 2004 | 1.20 | 3.40 |
| 2005 | 1.10 | 3.70 |
| 2006 | 1.10 | 3.70 |
| 2007 | .40 | .40 |
| 2008 | .40 | .40 |
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