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| year | production | consumption |
| 1986 | 63.00 | 98.00 |
| 1987 | 63.00 | 111.00 |
| 1988 | 60.00 | 123.00 |
| 1989 | 73.00 | 147.00 |
| 1990 | 61.00 | 169.00 |
| 1991 | 83.00 | 172.00 |
| 1992 | 102.00 | 178.00 |
| 1993 | 125.00 | 207.00 |
| 1994 | 145.00 | 229.00 |
| 1995 | 173.00 | 269.00 |
| 1996 | 238.00 | 306.00 |
| 1997 | 295.00 | 302.00 |
| 1998 | 283.00 | 264.00 |
| 1999 | 275.00 | 264.00 |
| 2000 | 282.00 | 263.00 |
| 2001 | 293.00 | 268.00 |
| 2002 | 300.00 | 277.00 |
| 2003 | 323.00 | 303.00 |
| 2004 | 348.00 | 338.00 |
| 2005 | 349.00 | 342.00 |
| 2006 | 355.00 | 324.00 |
| 2007 | 376.00 | 329.00 |
| 2008 | 363.00 | 300.00 |
| 2009 | 388.00 | 319.00 |
| 2010 | 404.00 | 319.00 |
| 2011 | 406.00 | 348.00 |
| 2012 | 442.00 | 362.00 |
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