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Loading...
| year | production | consumption |
| 1986 | 4.20 | 5.10 |
| 1987 | 4.20 | 5.30 |
| 1988 | 4.00 | 5.10 |
| 1989 | 4.00 | 5.10 |
| 1990 | 4.30 | 5.40 |
| 1991 | 5.00 | 5.50 |
| 1992 | 4.20 | 5.50 |
| 1993 | 4.20 | 5.50 |
| 1994 | 3.20 | 4.20 |
| 1995 | 3.30 | 3.90 |
| 1996 | 1.50 | 2.50 |
| 1997 | 1.70 | 2.50 |
| 1998 | 3.70 | 4.60 |
| 1999 | 3.90 | 4.40 |
| 2000 | 3.90 | 4.80 |
| 2001 | .80 | .80 |
| 2002 | .80 | .80 |
| 2003 | .80 | .80 |
| 2004 | .80 | .80 |
| 2005 | .70 | .70 |
| 2006 | .50 | .50 |
| 2007 | .60 | .60 |
| 2008 | .60 | .70 |
| 2009 | .50 | .50 |
| 2010 | .80 | .80 |
| 2011 | .80 | .80 |
| 2012 | .80 | .80 |
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