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| year | production | consumption |
| 1986 | 73.00 | 1.80 |
| 1987 | 77.00 | 3.20 |
| 1988 | 75.00 | 3.40 |
| 1989 | 79.00 | 2.90 |
| 1990 | 80.00 | 3.20 |
| 1991 | 84.00 | 3.40 |
| 1992 | 81.00 | 2.00 |
| 1993 | 83.00 | 2.70 |
| 1994 | 83.00 | 3.00 |
| 1995 | 84.00 | 3.30 |
| 1996 | 87.00 | 2.20 |
| 1997 | 91.00 | 2.10 |
| 1998 | 87.00 | 2.60 |
| 1999 | 90.00 | 2.60 |
| 2000 | 88.00 | 2.80 |
| 2001 | 84.00 | 3.50 |
| 2002 | 87.00 | 3.40 |
| 2003 | 88.00 | 3.90 |
| 2004 | 92.00 | 4.60 |
| 2005 | 92.00 | 4.60 |
| 2006 | 93.00 | 6.60 |
| 2007 | 94.00 | 7.50 |
| 2008 | 94.00 | 8.10 |
| 2009 | 93.00 | 8.80 |
| 2010 | 87.00 | 7.30 |
| 2011 | 78.00 | 6.60 |
| 2012 | 83.00 | 6.50 |
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