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| year | production | consumption |
| 1986 | .40 | .70 |
| 1987 | .40 | .60 |
| 1988 | .50 | .70 |
| 1989 | .70 | .80 |
| 1990 | .70 | .80 |
| 1991 | .60 | .80 |
| 1992 | .50 | .80 |
| 1993 | .60 | 1.00 |
| 1994 | .60 | 1.00 |
| 1995 | .60 | 1.00 |
| 1996 | .80 | 1.20 |
| 1997 | 1.40 | 2.20 |
| 1998 | 1.70 | 2.50 |
| 1999 | 1.70 | 2.50 |
| 2000 | 1.20 | 1.60 |
| 2001 | 2.30 | 1.20 |
| 2002 | 2.40 | 2.30 |
| 2003 | 2.50 | 2.50 |
| 2004 | 2.60 | 2.50 |
| 2005 | 2.20 | 2.20 |
| 2006 | 1.20 | 3.30 |
| 2007 | 1.20 | 3.30 |
| 2008 | 3.70 | 5.70 |
| 2009 | 3.50 | 5.70 |
| 2010 | .70 | 4.20 |
| 2011 | .40 | 3.10 |
| 2012 | .10 | 3.40 |
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