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Loading...
| year | production | consumption |
| 1980 | 44.00 | 44.00 |
| 1981 | 41.00 | 42.00 |
| 1982 | 45.00 | 45.00 |
| 1983 | 39.00 | 38.00 |
| 1984 | 34.00 | 36.00 |
| 1985 | 32.00 | 32.00 |
| 1986 | 27.00 | 30.00 |
| 1987 | 31.00 | 31.00 |
| 1988 | 29.00 | 29.00 |
| 1989 | 28.00 | 26.00 |
| 1990 | 17.00 | 17.00 |
| 1991 | 19.00 | 10.00 |
| 1992 | 21.00 | 12.00 |
| 1993 | 12.00 | 13.00 |
| 1994 | 11.00 | 10.00 |
| 1995 | 6.90 | 7.70 |
| 1996 | 7.40 | 7.20 |
| 1997 | 3.50 | 3.60 |
| 1998 | 2.30 | 2.50 |
| 1999 | 1.10 | 1.10 |
| 2000 | 1.10 | 1.40 |
| 2001 | 1.50 | 1.80 |
| 2002 | 1.40 | 1.60 |
| 2003 | 1.40 | .70 |
| 2004 | 1.30 | .80 |
| 2005 | .90 | .80 |
| 2006 | .40 | 1.00 |
| 2007 | .00 | .90 |
| 2008 | .00 | .40 |
| 2009 | .00 | .40 |
| 2010 | .00 | .60 |
| 2011 | .00 | .60 |
| 2012 | .00 | .00 |
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