|
| year | production | consumption |
| 1980 | 472.00 | 16.60 |
| 1981 | 405.00 | 18.00 |
| 1982 | 330.00 | 20.60 |
| 1983 | 295.00 | 22.00 |
| 1984 | 394.00 | 24.00 |
| 1985 | 301.00 | 25.00 |
| 1986 | 308.00 | 27.66 |
| 1987 | 293.00 | 28.88 |
| 1988 | 346.00 | 26.87 |
| 1989 | 380.00 | 27.59 |
| 1990 | 406.00 | 27.77 |
| 1991 | 395.00 | 28.02 |
| 1992 | 423.20 | 30.09 |
| 1993 | 413.00 | 31.63 |
| 1994 | 415.00 | 32.44 |
| 1995 | 442.00 | 34.70 |
| 1996 | 510.48 | 39.90 |
| 1997 | 550.00 | 40.32 |
| 1998 | 695.60 | 41.86 |
| 1999 | 665.00 | 43.25 |
| 2000 | 737.20 | 48.17 |
| 2001 | 714.15 | 54.48 |
| 2002 | 679.11 | 62.25 |
| 2003 | 715.00 | 71.88 |
| 2004 | 782.54 | 82.85 |
| 2005 | 835.00 | 86.08 |
| 2006 | 850.12 | 95.00 |
| 2007 | 850.61 | 121.58 |
| 2008 | 924.03 | 165.55 |
| 2009 | 926.55 | 134.20 |
| 2010 | 1,126.74 | 123.31 |
| 2011 | 1,295.92 | 183.00 |
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