|
| year | production | consumption |
| 1980 | 175.00 | 11.00 |
| 1981 | 151.00 | 12.00 |
| 1982 | 156.00 | 11.00 |
| 1983 | 157.00 | 14.00 |
| 1984 | 157.00 | 12.00 |
| 1985 | 172.00 | 10.84 |
| 1986 | 166.00 | 9.83 |
| 1987 | 155.00 | 10.40 |
| 1988 | 159.00 | 11.75 |
| 1989 | 208.00 | 15.62 |
| 1990 | 270.00 | 15.32 |
| 1991 | 294.00 | 15.51 |
| 1992 | 297.65 | 16.09 |
| 1993 | 312.50 | 15.08 |
| 1994 | 328.55 | 15.25 |
| 1995 | 365.00 | 14.10 |
| 1996 | 368.36 | 15.04 |
| 1997 | 370.41 | 16.09 |
| 1998 | 352.00 | 15.29 |
| 1999 | 331.00 | 13.19 |
| 2000 | 315.00 | 12.14 |
| 2001 | 270.00 | 12.53 |
| 2002 | 251.20 | 11.94 |
| 2003 | 241.42 | 12.58 |
| 2004 | 239.05 | 12.72 |
| 2005 | 266.32 | 12.67 |
| 2006 | 237.22 | 13.89 |
| 2007 | 244.22 | 15.46 |
| 2008 | 248.14 | 19.64 |
| 2009 | 242.13 | 14.30 |
| 2010 | 245.88 | 16.54 |
| 2011 | 244.72 | 14.00 |
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