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| year | production | consumption |
| 1986 | .00 | 3.20 |
| 1987 | .00 | 4.40 |
| 1988 | .00 | 3.60 |
| 1989 | .00 | 3.60 |
| 1990 | .00 | 3.60 |
| 1991 | .00 | 3.80 |
| 1992 | .00 | 3.70 |
| 1993 | .00 | 4.10 |
| 1994 | .00 | 4.10 |
| 1995 | .00 | 4.10 |
| 1996 | .00 | 4.10 |
| 1997 | .00 | 4.20 |
| 1998 | .00 | 4.20 |
| 1999 | .00 | 4.20 |
| 2000 | 4.70 | 4.50 |
| 2001 | 5.80 | 4.80 |
| 2002 | 5.80 | 4.80 |
| 2003 | 6.20 | 5.20 |
| 2004 | 6.20 | 5.20 |
| 2005 | 6.40 | 5.40 |
| 2006 | 6.70 | 5.60 |
| 2007 | 6.60 | 5.50 |
| 2008 | 6.60 | 5.50 |
| 2009 | 6.70 | 5.60 |
| 2010 | 14.00 | 6.90 |
| 2011 | 14.00 | 6.90 |
| 2012 | 14.00 | 6.90 |
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