|
| year | production | consumption |
| 1980 | 164.00 | 110.00 |
| 1981 | 166.00 | 120.00 |
| 1982 | 160.00 | 121.40 |
| 1983 | 167.00 | 139.40 |
| 1984 | 170.00 | 154.00 |
| 1985 | 178.00 | 164.00 |
| 1986 | 194.00 | 163.46 |
| 1987 | 230.00 | 180.16 |
| 1988 | 265.00 | 191.63 |
| 1989 | 340.00 | 198.30 |
| 1990 | 388.00 | 205.27 |
| 1991 | 492.00 | 177.83 |
| 1992 | 480.95 | 184.54 |
| 1993 | 554.00 | 208.87 |
| 1994 | 560.00 | 224.25 |
| 1995 | 575.00 | 226.00 |
| 1996 | 582.30 | 229.34 |
| 1997 | 561.23 | 239.94 |
| 1998 | 553.37 | 248.18 |
| 1999 | 538.00 | 255.78 |
| 2000 | 522.83 | 255.52 |
| 2001 | 483.94 | 253.73 |
| 2002 | 472.23 | 256.08 |
| 2003 | 463.98 | 257.10 |
| 2004 | 446.06 | 257.62 |
| 2005 | 432.04 | 258.65 |
| 2006 | 406.38 | 261.12 |
| 2007 | 380.00 | 264.31 |
| 2008 | 369.30 | 309.57 |
| 2009 | 368.00 | 314.55 |
| 2010 | 367.13 | 317.80 |
| 2011 | 300.21 | 258.00 |
|
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