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Loading...
| year | production | consumption |
| 1986 | .20 | .20 |
| 1987 | .30 | .20 |
| 1988 | .30 | .20 |
| 1989 | .20 | .20 |
| 1990 | .30 | .20 |
| 1991 | .30 | .20 |
| 1992 | .20 | .20 |
| 1993 | .40 | .30 |
| 1994 | .40 | .30 |
| 1995 | .40 | .30 |
| 1996 | .40 | .30 |
| 1997 | .30 | .20 |
| 1998 | .40 | .30 |
| 1999 | .50 | .40 |
| 2000 | .40 | .40 |
| 2001 | .50 | .40 |
| 2002 | .50 | .40 |
| 2003 | .60 | .50 |
| 2004 | .40 | .30 |
| 2005 | .40 | .30 |
| 2006 | .10 | .30 |
| 2007 | 2.10 | 2.10 |
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