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| year | production | consumption |
| 1986 | 29.00 | 39.00 |
| 1987 | 30.00 | 41.00 |
| 1988 | 30.00 | 40.00 |
| 1989 | 32.00 | 46.00 |
| 1990 | 35.00 | 54.00 |
| 1991 | 40.00 | 62.00 |
| 1992 | 39.00 | 62.00 |
| 1993 | 34.00 | 80.00 |
| 1994 | 36.00 | 96.00 |
| 1995 | 34.00 | 105.00 |
| 1996 | 37.00 | 123.00 |
| 1997 | 41.00 | 129.00 |
| 1998 | 38.00 | 144.00 |
| 1999 | 39.00 | 139.00 |
| 2000 | 57.00 | 148.00 |
| 2001 | 60.00 | 147.00 |
| 2002 | 58.00 | 136.00 |
| 2003 | 59.00 | 73.00 |
| 2004 | 60.00 | 83.00 |
| 2005 | 64.00 | 91.00 |
| 2006 | 61.00 | 123.00 |
| 2007 | 61.00 | 137.00 |
| 2008 | 56.00 | 141.00 |
| 2009 | 48.00 | 148.00 |
| 2010 | 47.00 | 166.00 |
| 2011 | 42.00 | 157.00 |
| 2012 | 51.00 | 150.00 |
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