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| year | production | consumption |
| 1986 | .90 | 1.00 |
| 1987 | .80 | .90 |
| 1988 | .80 | 1.60 |
| 1989 | .70 | 1.30 |
| 1990 | .80 | .90 |
| 1991 | .90 | 1.60 |
| 1992 | .80 | 1.60 |
| 1993 | .80 | 2.00 |
| 1994 | 1.30 | 2.60 |
| 1995 | .60 | 2.20 |
| 1996 | .50 | 3.50 |
| 1997 | .50 | 3.50 |
| 1998 | .60 | 3.70 |
| 1999 | .60 | 4.10 |
| 2000 | .50 | 4.50 |
| 2001 | .50 | 4.70 |
| 2002 | .50 | 4.00 |
| 2003 | .40 | 5.60 |
| 2004 | .50 | 5.20 |
| 2005 | .50 | 5.40 |
| 2006 | .60 | 6.70 |
| 2007 | .60 | 6.90 |
| 2008 | .40 | 7.00 |
| 2009 | .40 | 7.40 |
| 2010 | .40 | 7.80 |
| 2011 | .40 | 6.70 |
| 2012 | .20 | 7.70 |
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