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Loading...
| year | production | consumption |
| 1986 | .10 | .50 |
| 1987 | .10 | .60 |
| 1988 | .20 | .80 |
| 1989 | .20 | .90 |
| 1990 | .20 | 1.10 |
| 1991 | .20 | 1.20 |
| 1992 | .20 | 1.30 |
| 1993 | .10 | 1.30 |
| 1994 | .10 | 1.00 |
| 1995 | .10 | .70 |
| 1996 | .10 | .70 |
| 1997 | .30 | 2.40 |
| 1998 | .20 | 2.80 |
| 1999 | .30 | 3.20 |
| 2000 | .30 | 3.20 |
| 2001 | .20 | 3.40 |
| 2002 | .30 | 3.60 |
| 2003 | .40 | 3.80 |
| 2004 | .30 | 4.10 |
| 2005 | .30 | 4.20 |
| 2008 | .00 | 3.90 |
| 2009 | .10 | 4.10 |
| 2010 | .10 | 3.70 |
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