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| year | production | consumption |
| 1986 | 3.70 | 10.00 |
| 1987 | 4.50 | 9.00 |
| 1988 | 4.60 | 10.00 |
| 1989 | 4.70 | 10.00 |
| 1990 | 3.90 | 11.00 |
| 1991 | 4.80 | 10.00 |
| 1992 | 5.60 | 11.00 |
| 1993 | 5.00 | 13.00 |
| 1994 | 6.00 | 15.00 |
| 1995 | 5.20 | 14.00 |
| 1996 | 5.10 | 15.00 |
| 1997 | 6.60 | 17.00 |
| 1998 | 6.70 | 19.00 |
| 1999 | 5.80 | 19.00 |
| 2000 | 5.80 | 18.00 |
| 2001 | 5.50 | 21.00 |
| 2002 | 4.20 | 20.00 |
| 2003 | .00 | 22.00 |
| 2004 | .00 | 22.00 |
| 2005 | .50 | 23.00 |
| 2006 | .40 | 24.00 |
| 2007 | .50 | 26.00 |
| 2008 | .40 | 23.00 |
| 2009 | .50 | 26.00 |
| 2010 | .50 | 26.00 |
| 2011 | .70 | 25.00 |
| 2012 | .60 | 26.00 |
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