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Loading...
| year | production | consumption |
| 1986 | 8.90 | 8.80 |
| 1987 | 6.80 | 11.00 |
| 1988 | 7.60 | 9.60 |
| 1989 | 9.20 | 9.50 |
| 1990 | 10.00 | 11.00 |
| 1991 | 9.20 | 8.70 |
| 1992 | 8.30 | 10.00 |
| 1993 | 7.60 | 7.80 |
| 1994 | 7.30 | 7.20 |
| 1995 | 6.80 | 6.80 |
| 1996 | 4.20 | 5.70 |
| 1997 | 3.40 | 5.80 |
| 1998 | 4.20 | 5.20 |
| 1999 | 4.20 | 5.30 |
| 2000 | 1.80 | 2.20 |
| 2001 | 1.50 | 1.50 |
| 2002 | .80 | 1.20 |
| 2003 | .60 | .60 |
| 2004 | .60 | .60 |
| 2005 | .50 | .70 |
| 2006 | .50 | .50 |
| 2007 | .40 | .40 |
| 2008 | .20 | .20 |
| 2009 | .20 | .20 |
| 2010 | .90 | 7.40 |
| 2011 | .80 | 7.30 |
| 2012 | .40 | .30 |
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