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| year | production | consumption |
| 1980 | 46.00 | 314.00 |
| 1981 | 46.00 | 280.00 |
| 1982 | 50.00 | 327.00 |
| 1983 | 44.00 | 342.00 |
| 1984 | 41.00 | 343.00 |
| 1985 | 41.00 | 359.00 |
| 1986 | 46.00 | 388.00 |
| 1987 | 51.00 | 441.00 |
| 1988 | 50.00 | 436.00 |
| 1989 | 56.00 | 448.00 |
| 1990 | 73.00 | 477.00 |
| 1991 | 88.00 | 466.00 |
| 1992 | 84.00 | 492.00 |
| 1993 | 76.00 | 565.00 |
| 1994 | 72.00 | 542.00 |
| 1995 | 67.00 | 608.00 |
| 1996 | 67.00 | 634.00 |
| 1997 | 68.00 | 631.00 |
| 1998 | 65.00 | 629.00 |
| 1999 | 59.00 | 627.00 |
| 2000 | 53.00 | 667.00 |
| 2001 | 48.00 | 619.00 |
| 2002 | 47.00 | 658.00 |
| 2003 | 45.00 | 645.00 |
| 2004 | 42.00 | 661.00 |
| 2005 | 44.00 | 659.00 |
| 2006 | 42.00 | 678.00 |
| 2007 | 41.00 | 680.00 |
| 2008 | 42.00 | 668.00 |
| 2009 | 46.00 | 703.00 |
| 2010 | 48.00 | 673.00 |
| 2011 | 46.00 | 655.00 |
| 2012 | 45.00 | 689.00 |
| 2013 | 46.00 | 731.00 |
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