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| year | production | consumption |
| 1986 | 3.80 | 54.00 |
| 1987 | 48.00 | 62.00 |
| 1988 | 48.00 | 76.00 |
| 1989 | 76.00 | 90.00 |
| 1990 | 86.00 | 88.00 |
| 1991 | 91.00 | 93.00 |
| 1992 | 116.00 | 117.00 |
| 1993 | 123.00 | 127.00 |
| 1994 | 146.00 | 191.00 |
| 1995 | 175.00 | 207.00 |
| 1996 | 196.00 | 262.00 |
| 1997 | 198.00 | 291.00 |
| 1998 | 242.00 | 375.00 |
| 1999 | 240.00 | 362.00 |
| 2000 | 309.00 | 461.00 |
| 2001 | 309.00 | 460.00 |
| 2002 | 336.00 | 521.00 |
| 2003 | 392.00 | 587.00 |
| 2004 | 474.00 | 658.00 |
| 2005 | 464.00 | 649.00 |
| 2006 | 563.00 | 727.00 |
| 2007 | 615.00 | 740.00 |
| 2008 | 609.00 | 676.00 |
| 2009 | 593.00 | 695.00 |
| 2010 | 680.00 | 724.00 |
| 2011 | 688.00 | 756.00 |
| 2012 | 687.00 | 767.00 |
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