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Loading...
| year | production | consumption |
| 1986 | 2.80 | 1.60 |
| 1987 | 3.00 | .60 |
| 1988 | 3.10 | 3.00 |
| 1989 | 2.30 | 2.10 |
| 1990 | 2.80 | 2.50 |
| 1991 | 2.10 | 3.60 |
| 1992 | 2.30 | 4.00 |
| 1993 | 2.70 | .20 |
| 1994 | 4.20 | 2.80 |
| 1995 | 5.30 | 4.90 |
| 1996 | 6.30 | 6.80 |
| 1997 | 10.00 | .20 |
| 1998 | 6.70 | 6.20 |
| 1999 | .20 | .20 |
| 2000 | .20 | .20 |
| 2001 | .20 | .20 |
| 2002 | .20 | .20 |
| 2003 | .30 | .30 |
| 2004 | .40 | .40 |
| 2005 | .20 | .20 |
| 2006 | .20 | .20 |
| 2007 | .10 | .10 |
| 2010 | .00 | .00 |
| 2011 | .00 | .00 |
| 2012 | .00 | .00 |
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