|
| year | production | consumption |
| 1980 | 126.00 | 160.70 |
| 1981 | 125.00 | 163.70 |
| 1982 | 141.00 | 167.60 |
| 1983 | 152.00 | 171.80 |
| 1984 | 168.00 | 174.00 |
| 1985 | 176.00 | 171.47 |
| 1986 | 305.00 | 171.82 |
| 1987 | 385.00 | 184.57 |
| 1988 | 378.00 | 198.44 |
| 1989 | 403.00 | 208.53 |
| 1990 | 440.00 | 196.91 |
| 1991 | 419.00 | 204.88 |
| 1992 | 433.00 | 229.53 |
| 1993 | 456.00 | 240.22 |
| 1994 | 450.00 | 244.41 |
| 1995 | 585.00 | 250.63 |
| 1996 | 622.96 | 278.13 |
| 1997 | 652.00 | 286.51 |
| 1998 | 732.52 | 289.02 |
| 1999 | 816.00 | 277.40 |
| 2000 | 690.58 | 277.49 |
| 2001 | 625.00 | 271.18 |
| 2002 | 576.94 | 261.20 |
| 2003 | 540.73 | 265.36 |
| 2004 | 528.76 | 267.52 |
| 2005 | 525.79 | 270.71 |
| 2006 | 531.04 | 274.16 |
| 2007 | 531.14 | 279.89 |
| 2008 | 588.36 | 259.78 |
| 2009 | 670.65 | 257.50 |
| 2010 | 785.53 | 267.45 |
| 2011 | 914.25 | 298.00 |
|
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