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Loading...
| year | production | consumption |
| 1986 | 2.50 | 2.50 |
| 1987 | 3.20 | 3.00 |
| 1988 | 3.20 | 3.20 |
| 1989 | 3.30 | 3.30 |
| 1990 | 3.80 | 3.60 |
| 1991 | 3.30 | 3.30 |
| 1992 | 5.40 | 5.40 |
| 1993 | 5.20 | 5.20 |
| 1994 | 5.40 | 6.50 |
| 1995 | 5.70 | 8.10 |
| 1996 | 5.20 | 8.80 |
| 1997 | 4.50 | 10.00 |
| 1998 | 4.70 | 15.00 |
| 1999 | 6.10 | 15.00 |
| 2000 | 6.00 | 14.00 |
| 2001 | 5.50 | 15.00 |
| 2002 | 4.00 | 15.00 |
| 2003 | .00 | 15.00 |
| 2004 | .00 | 17.00 |
| 2007 | .00 | 17.00 |
| 2008 | .00 | 14.00 |
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