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| year | production | consumption |
| 1986 | 1.20 | 5.90 |
| 1988 | 1.00 | 6.40 |
| 1991 | 4.60 | 8.20 |
| 1992 | 5.10 | 8.70 |
| 1993 | 4.40 | 9.10 |
| 1994 | 4.50 | 9.90 |
| 1995 | 4.20 | 10.00 |
| 1996 | 4.60 | 10.00 |
| 1997 | 3.90 | 11.00 |
| 1998 | 4.10 | 11.00 |
| 1999 | .40 | 8.60 |
| 2000 | .40 | 12.00 |
| 2001 | 1.50 | 13.00 |
| 2002 | 1.70 | 11.00 |
| 2003 | 1.60 | 12.00 |
| 2004 | 4.40 | 12.00 |
| 2005 | 1.30 | 12.00 |
| 2006 | 1.30 | 15.00 |
| 2007 | 1.30 | 15.00 |
| 2008 | 1.70 | 15.00 |
| 2009 | 1.60 | 15.00 |
| 2010 | 5.70 | 16.00 |
| 2011 | .40 | 15.00 |
| 2012 | 1.00 | 15.00 |
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