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| year | production | consumption |
| 1986 | 118.00 | 120.00 |
| 1987 | 116.00 | 119.00 |
| 1988 | 113.00 | 122.00 |
| 1989 | 119.00 | 128.00 |
| 1990 | 125.00 | 135.00 |
| 1991 | 123.00 | 140.00 |
| 1992 | 134.00 | 145.00 |
| 1993 | 138.00 | 149.00 |
| 1994 | 140.00 | 154.00 |
| 1995 | 144.00 | 135.00 |
| 1996 | 140.00 | 148.00 |
| 1997 | 143.00 | 155.00 |
| 1998 | 126.00 | 153.00 |
| 1999 | 160.00 | 206.00 |
| 2000 | 165.00 | 209.00 |
| 2001 | 159.00 | 205.00 |
| 2002 | 154.00 | 201.00 |
| 2003 | 160.00 | 200.00 |
| 2004 | 155.00 | 204.00 |
| 2005 | 162.00 | 197.00 |
| 2006 | 152.00 | 183.00 |
| 2007 | 142.00 | 161.00 |
| 2008 | 131.00 | 137.00 |
| 2009 | 80.00 | 99.00 |
| 2010 | 55.00 | 51.00 |
| 2011 | 39.00 | 32.00 |
| 2012 | 30.00 | 24.00 |
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