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| year | production | consumption |
| 1986 | 2.50 | 1.80 |
| 1987 | 2.30 | 1.60 |
| 1988 | 2.80 | 2.30 |
| 1989 | 1.60 | .60 |
| 1990 | 2.30 | .60 |
| 1991 | 2.60 | .80 |
| 1992 | 1.30 | 1.10 |
| 1993 | 1.40 | .50 |
| 1994 | 1.40 | 1.10 |
| 1995 | 1.40 | 1.30 |
| 1996 | 1.40 | 1.30 |
| 1997 | 1.40 | 1.30 |
| 1998 | 1.40 | 1.30 |
| 1999 | 1.40 | 1.30 |
| 2000 | 1.50 | 1.40 |
| 2001 | 1.50 | 1.40 |
| 2002 | 1.50 | 1.40 |
| 2003 | 1.50 | 1.40 |
| 2004 | 1.50 | 1.40 |
| 2005 | 1.90 | 1.70 |
| 2006 | .00 | 1.30 |
| 2007 | .00 | 1.60 |
| 2008 | .00 | 1.00 |
| 2009 | .00 | 1.10 |
| 2010 | .00 | 1.10 |
| 2011 | .00 | 1.10 |
| 2012 | .00 | 1.10 |
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