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| year | production | consumption |
| 1980 | 64.60 | 64.60 |
| 1981 | 78.10 | 78.10 |
| 1982 | 116.00 | 116.00 |
| 1983 | 164.10 | 164.10 |
| 1984 | 228.20 | 228.20 |
| 1985 | 245.00 | 245.10 |
| 1986 | 228.20 | 228.00 |
| 1987 | 251.30 | 251.30 |
| 1988 | 257.30 | 257.40 |
| 1989 | 261.40 | 261.30 |
| 1990 | 255.10 | 235.40 |
| 1991 | 280.10 | 258.20 |
| 1992 | 269.10 | 248.00 |
| 1993 | 272.60 | 252.50 |
| 1994 | 302.60 | 267.50 |
| 1995 | 311.40 | 289.20 |
| 1996 | 308.90 | 291.60 |
| 1997 | 354.30 | 324.40 |
| 1998 | 338.40 | 312.40 |
| 1999 | 325.00 | 304.50 |
| 2000 | 299.90 | 285.70 |
| 2001 | 323.50 | 265.90 |
| 2002 | 378.40 | 313.90 |
| 2003 | 465.20 | 359.30 |
| 2004 | 510.50 | 445.30 |
| 2005 | 584.90 | 501.10 |
| 2006 | 715.20 | 629.70 |
| 2007 | 920.90 | 816.00 |
| 2008 | 1,209.00 | 1,107.10 |
| 2009 | 1,322.50 | 1,280.40 |
| 2010 | 1,520.30 | 1,419.10 |
| 2011 | 1,486.10 | 1,406.50 |
| 2012 | 1,462.40 | 1,441.00 |
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