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Loading...
| year | production | consumption |
| 1980 | .00 | 5.00 |
| 1981 | .00 | 5.00 |
| 1982 | .00 | 4.00 |
| 1983 | .00 | 2.00 |
| 1984 | 2.60 | 1.40 |
| 1985 | 4.10 | 1.60 |
| 1986 | 5.00 | 1.90 |
| 1987 | 5.80 | 1.80 |
| 1988 | 5.50 | 1.80 |
| 1989 | 4.90 | 1.40 |
| 1990 | 4.80 | 1.60 |
| 1991 | 2.70 | .50 |
| 1992 | 2.80 | 1.30 |
| 1993 | 1.90 | 1.60 |
| 1994 | 1.80 | 1.70 |
| 1995 | 1.80 | 1.80 |
| 1996 | .90 | 1.30 |
| 1997 | .00 | .80 |
| 1998 | .00 | .20 |
| 1999 | .00 | .10 |
| 2003 | .00 | .00 |
| 2004 | .00 | .00 |
| 2005 | .00 | .00 |
| 2008 | .00 | .00 |
| 2009 | .00 | .00 |
| 2010 | .00 | .00 |
| 2012 | .00 | .00 |
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