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| year | production | consumption |
| 1986 | 43.00 | 44.00 |
| 1987 | 46.00 | 49.00 |
| 1988 | 57.00 | 52.00 |
| 1989 | 57.00 | 61.00 |
| 1990 | 65.00 | 69.00 |
| 1991 | 66.00 | 73.00 |
| 1992 | 73.00 | 80.00 |
| 1993 | 69.00 | 104.00 |
| 1994 | 79.00 | 101.00 |
| 1995 | 86.00 | 107.00 |
| 1996 | 105.00 | 104.00 |
| 1997 | 110.00 | 118.00 |
| 1998 | 101.00 | 118.00 |
| 1999 | 100.00 | 112.00 |
| 2000 | 96.00 | 113.00 |
| 2001 | 93.00 | 118.00 |
| 2002 | 82.00 | 119.00 |
| 2003 | 79.00 | 121.00 |
| 2004 | 59.00 | 122.00 |
| 2005 | 68.00 | 104.00 |
| 2006 | 74.00 | 103.00 |
| 2007 | 74.00 | 115.00 |
| 2008 | 67.00 | 121.00 |
| 2009 | 51.00 | 113.00 |
| 2010 | 63.00 | 123.00 |
| 2011 | 69.00 | 122.00 |
| 2012 | 62.00 | 127.00 |
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