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| year | production | consumption |
| 1986 | 36.00 | .60 |
| 1987 | 41.00 | .70 |
| 1988 | 40.00 | .60 |
| 1989 | 61.00 | 1.00 |
| 1990 | 40.00 | .70 |
| 1991 | 12.00 | .60 |
| 1992 | 21.00 | .80 |
| 1993 | 22.00 | 1.20 |
| 1994 | 29.00 | .90 |
| 1995 | 30.00 | .50 |
| 1996 | 30.00 | .50 |
| 1997 | 141.00 | .60 |
| 1998 | 141.00 | .60 |
| 1999 | 109.00 | .50 |
| 2000 | 74.00 | .60 |
| 2001 | 83.00 | .60 |
| 2002 | 124.00 | .60 |
| 2003 | 104.00 | 1.00 |
| 2004 | 98.00 | 1.00 |
| 2005 | 128.00 | .60 |
| 2006 | 122.00 | .60 |
| 2007 | 129.00 | .70 |
| 2008 | 121.00 | .90 |
| 2009 | 123.00 | .80 |
| 2010 | 127.00 | .80 |
| 2011 | 125.00 | .90 |
| 2012 | 136.00 | 1.00 |
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