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| year | production | consumption |
| 1986 | 48.00 | 62.00 |
| 1987 | 47.00 | 60.00 |
| 1988 | 49.00 | 63.00 |
| 1989 | 62.00 | 73.00 |
| 1990 | 70.00 | 88.00 |
| 1991 | 65.00 | 98.00 |
| 1992 | 81.00 | 104.00 |
| 1993 | 86.00 | 108.00 |
| 1994 | 105.00 | 128.00 |
| 1995 | 119.00 | 139.00 |
| 1996 | 126.00 | 147.00 |
| 1997 | 134.00 | 144.00 |
| 1998 | 119.00 | 129.00 |
| 1999 | 135.00 | 136.00 |
| 2000 | 162.00 | 157.00 |
| 2001 | 170.00 | 166.00 |
| 2002 | 169.00 | 162.00 |
| 2003 | 182.00 | 179.00 |
| 2004 | 193.00 | 184.00 |
| 2005 | 204.00 | 196.00 |
| 2006 | 181.00 | 175.00 |
| 2007 | 174.00 | 184.00 |
| 2008 | 188.00 | 197.00 |
| 2009 | 190.00 | 181.00 |
| 2010 | 169.00 | 182.00 |
| 2011 | 180.00 | 197.00 |
| 2012 | 202.00 | 186.00 |
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