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| year | production | consumption |
| 1986 | 1.10 | 1.70 |
| 1987 | 1.30 | 1.60 |
| 1988 | .20 | 1.20 |
| 1989 | .30 | 1.30 |
| 1990 | .50 | 1.40 |
| 1991 | .30 | 1.40 |
| 1992 | .50 | 1.50 |
| 1993 | 1.60 | 1.60 |
| 1994 | .30 | 2.60 |
| 1995 | .20 | 1.30 |
| 1996 | .30 | 3.10 |
| 1997 | .30 | 2.90 |
| 1998 | .40 | 2.40 |
| 2000 | .30 | 2.10 |
| 2001 | .30 | 2.10 |
| 2002 | .50 | 2.30 |
| 2003 | .20 | 2.40 |
| 2004 | .20 | 2.40 |
| 2005 | .20 | 2.40 |
| 2006 | .30 | 2.60 |
| 2007 | .30 | 3.20 |
| 2008 | .40 | 2.70 |
| 2009 | .30 | 2.40 |
| 2010 | .30 | 2.60 |
| 2011 | .40 | 2.70 |
| 2012 | .30 | 2.80 |
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