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| year | production | consumption |
| 1980 | 283.00 | 160.00 |
| 1981 | 264.00 | 165.00 |
| 1982 | 306.00 | 180.00 |
| 1983 | 365.00 | 192.00 |
| 1984 | 440.00 | 194.00 |
| 1985 | 440.00 | 194.00 |
| 1986 | 504.00 | 192.00 |
| 1987 | 497.00 | 197.00 |
| 1988 | 540.00 | 202.00 |
| 1989 | 585.00 | 220.00 |
| 1990 | 619.00 | 266.00 |
| 1991 | 646.00 | 282.00 |
| 1992 | 653.00 | 302.00 |
| 1993 | 640.00 | 336.00 |
| 1994 | 645.00 | 378.00 |
| 1995 | 682.00 | 399.00 |
| 1996 | 695.00 | 435.00 |
| 1997 | 700.00 | 469.00 |
| 1998 | 720.00 | 449.00 |
| 1999 | 693.00 | 454.00 |
| 2000 | 690.00 | 465.00 |
| 2001 | 659.00 | 475.00 |
| 2002 | 698.00 | 463.00 |
| 2003 | 738.00 | 480.00 |
| 2004 | 763.00 | 508.00 |
| 2005 | 726.00 | 522.00 |
| 2006 | 692.00 | 534.00 |
| 2007 | 668.00 | 574.00 |
| 2008 | 686.00 | 568.00 |
| 2009 | 659.00 | 611.00 |
| 2010 | 638.00 | 631.00 |
| 2011 | 570.00 | 675.00 |
| 2012 | 586.00 | 670.00 |
| 2013 | 570.00 | 680.00 |
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