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Loading...
| year | production | consumption |
| 1980 | 10.00 | 10.00 |
| 1981 | 7.00 | 7.00 |
| 1982 | 7.00 | 7.00 |
| 1983 | 7.00 | 7.00 |
| 1984 | 7.20 | 5.70 |
| 1985 | 9.70 | 5.40 |
| 1986 | 6.40 | 5.30 |
| 1987 | 8.50 | 6.20 |
| 1988 | 11.00 | 5.60 |
| 1989 | 7.50 | 4.80 |
| 1990 | 3.60 | 3.90 |
| 1991 | 3.40 | 3.70 |
| 1992 | 3.20 | 3.00 |
| 1993 | 3.60 | 3.30 |
| 1994 | 2.50 | 2.40 |
| 1995 | 1.90 | 2.20 |
| 1996 | 2.20 | 2.00 |
| 1997 | 1.60 | 1.60 |
| 1998 | 1.90 | 1.70 |
| 1999 | 1.00 | 1.10 |
| 2000 | .70 | .80 |
| 2001 | .70 | .60 |
| 2002 | 1.00 | .60 |
| 2003 | 1.70 | 1.50 |
| 2004 | 1.40 | .80 |
| 2005 | .50 | .60 |
| 2006 | .70 | .50 |
| 2007 | 1.50 | .90 |
| 2008 | .30 | 1.10 |
| 2009 | .50 | .80 |
| 2010 | .80 | 1.20 |
| 2011 | 1.30 | 1.40 |
| 2012 | 1.00 | 1.00 |
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