|
| year | production | consumption |
| 1980 | | 271.00 |
| 1981 | | 241.00 |
| 1982 | | 221.00 |
| 1983 | | 208.00 |
| 1984 | | 214.00 |
| 1985 | | 205.00 |
| 1986 | | 223.00 |
| 1987 | | 231.00 |
| 1988 | | 230.00 |
| 1989 | | 228.00 |
| 1990 | | 225.00 |
| 1991 | | 226.00 |
| 1992 | | 225.00 |
| 1993 | | 212.00 |
| 1994 | | 220.00 |
| 1995 | | 203.00 |
| 1996 | | 203.00 |
| 1997 | | 204.00 |
| 1998 | | 210.00 |
| 1999 | | 211.00 |
| 2000 | | 212.82 |
| 2001 | | 211.54 |
| 2002 | | 217.21 |
| 2003 | | 220.37 |
| 2004 | | 219.23 |
| 2005 | | 218.45 |
| 2006 | | 223.36 |
| 2007 | | 227.27 |
| 2008 | | 218.08 |
| 2009 | | 206.61 |
| 2010 | | 214.15 |
| 2011 | | 204.79 |
|
|