|
| year | production | consumption |
| 1980 | 316.00 | 60.00 |
| 1981 | 342.55 | 62.00 |
| 1982 | 324.00 | 70.00 |
| 1983 | 331.00 | 52.00 |
| 1984 | 303.00 | 44.00 |
| 1985 | 295.00 | 53.00 |
| 1986 | 293.00 | 33.00 |
| 1987 | 307.60 | 57.18 |
| 1988 | 304.41 | 48.38 |
| 1989 | 307.25 | 56.87 |
| 1990 | 318.00 | 46.00 |
| 1991 | 277.00 | 15.00 |
| 1992 | 286.05 | 35.00 |
| 1993 | 292.41 | 28.61 |
| 1994 | 297.35 | 24.72 |
| 1995 | 330.20 | 34.26 |
| 1996 | 325.25 | 27.55 |
| 1997 | 324.19 | 31.08 |
| 1998 | 315.01 | 26.84 |
| 1999 | 333.73 | 36.73 |
| 2000 | 349.27 | 38.85 |
| 2001 | 365.51 | 47.68 |
| 2002 | 383.17 | 58.98 |
| 2003 | 402.59 | 61.09 |
| 2004 | 406.12 | 70.63 |
| 2005 | 406.12 | 82.99 |
| 2006 | 487.35 | 140.91 |
| 2007 | 474.99 | 144.83 |
| 2008 | 473.22 | 148.32 |
| 2009 | 399.06 | 87.93 |
| 2010 | 416.72 | 104.89 |
| 2011 | 439.32 | 106.65 |
|
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