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Loading...
| year | production | consumption |
| 1986 | 2.10 | 1.40 |
| 1987 | 2.00 | 2.00 |
| 1988 | 2.70 | 1.00 |
| 1989 | 5.20 | 2.70 |
| 1990 | 3.70 | 3.80 |
| 1991 | 4.00 | 3.50 |
| 1992 | 3.00 | 3.90 |
| 1993 | 4.60 | 4.40 |
| 1994 | 4.60 | 4.40 |
| 1995 | 4.60 | 4.40 |
| 1996 | 4.60 | 4.40 |
| 1997 | 4.70 | 4.40 |
| 1998 | 4.70 | 4.50 |
| 1999 | 4.90 | 4.60 |
| 2000 | .00 | 4.60 |
| 2001 | .00 | 2.20 |
| 2002 | .00 | 2.20 |
| 2003 | .00 | 2.40 |
| 2004 | .00 | 2.50 |
| 2005 | .00 | 2.70 |
| 2006 | .00 | 2.80 |
| 2007 | .00 | 3.20 |
| 2008 | .00 | 3.40 |
| 2009 | .00 | 3.60 |
| 2010 | .00 | 2.80 |
| 2011 | .00 | 3.50 |
| 2012 | .00 | 3.40 |
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