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Loading...
| year | production | consumption |
| 1986 | 8.80 | 7.90 |
| 1987 | 7.60 | 8.40 |
| 1988 | 8.20 | 8.40 |
| 1989 | 5.80 | 7.10 |
| 1990 | 5.50 | 6.90 |
| 1991 | 5.80 | 7.10 |
| 1992 | 5.80 | 5.80 |
| 1993 | 3.90 | 7.00 |
| 1994 | 2.80 | 2.80 |
| 1995 | 2.50 | 4.80 |
| 1996 | 2.30 | 2.30 |
| 1997 | 7.20 | 2.10 |
| 1998 | 2.50 | 1.80 |
| 1999 | 1.30 | 1.30 |
| 2000 | .70 | 1.10 |
| 2001 | .70 | 1.00 |
| 2002 | .60 | 1.00 |
| 2003 | .30 | .30 |
| 2004 | .50 | .50 |
| 2005 | .50 | .50 |
| 2006 | .40 | .40 |
| 2007 | .40 | .40 |
| 2008 | .40 | .40 |
| 2009 | .60 | .60 |
| 2010 | .70 | .70 |
| 2011 | .50 | .50 |
| 2012 | 1.40 | 1.40 |
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