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Loading...
| year | production | consumption |
| 1986 | 7.00 | 7.00 |
| 1987 | 8.60 | 7.60 |
| 1988 | 9.00 | 6.40 |
| 1989 | 6.60 | 6.60 |
| 1990 | 57.00 | 45.00 |
| 1991 | 56.00 | 47.00 |
| 1992 | 53.00 | 44.00 |
| 1993 | 53.00 | 46.00 |
| 1994 | 52.00 | 45.00 |
| 1995 | 57.00 | 52.00 |
| 1996 | 62.00 | 55.00 |
| 1997 | 61.00 | 61.00 |
| 1998 | 66.00 | 67.00 |
| 1999 | 66.00 | 63.00 |
| 2000 | 3.10 | 2.40 |
| 2001 | 3.90 | 4.90 |
| 2002 | 3.90 | 4.10 |
| 2003 | 3.70 | 3.70 |
| 2004 | 1.90 | 1.90 |
| 2005 | 1.10 | 1.10 |
| 2006 | .60 | .90 |
| 2007 | .40 | .40 |
| 2008 | .40 | .40 |
| 2009 | .40 | .40 |
| 2010 | .40 | .40 |
| 2011 | .50 | .50 |
| 2012 | .40 | .40 |
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