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| year | production | consumption |
| 1986 | 27.00 | 46.00 |
| 1987 | 25.00 | 50.00 |
| 1988 | 27.00 | 49.00 |
| 1989 | 30.00 | 58.00 |
| 1990 | 31.00 | 65.00 |
| 1991 | 29.00 | 70.00 |
| 1992 | 38.00 | 74.00 |
| 1993 | 40.00 | 69.00 |
| 1994 | 44.00 | 86.00 |
| 1995 | 52.00 | 98.00 |
| 1996 | 54.00 | 98.00 |
| 1997 | 53.00 | 114.00 |
| 1998 | 57.00 | 114.00 |
| 1999 | 68.00 | 140.00 |
| 2000 | 86.00 | 142.00 |
| 2001 | 103.00 | 147.00 |
| 2002 | 99.00 | 155.00 |
| 2003 | 102.00 | 159.00 |
| 2004 | 105.00 | 161.00 |
| 2005 | 109.00 | 163.00 |
| 2006 | 100.00 | 171.00 |
| 2007 | 134.00 | 201.00 |
| 2008 | 113.00 | 186.00 |
| 2009 | 98.00 | 195.00 |
| 2010 | 88.00 | 209.00 |
| 2011 | 81.00 | 176.00 |
| 2012 | 104.00 | 196.00 |
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