|
| year | production | consumption |
| 1984 | 271.87 | 123.54 |
| 1985 | 228.03 | 137.99 |
| 1986 | 248.72 | 160.80 |
| 1987 | 244.49 | 162.01 |
| 1988 | 252.61 | 183.18 |
| 1989 | 248.68 | 175.52 |
| 1990 | 235.80 | 182.13 |
| 1991 | 255.59 | 187.62 |
| 1992 | 259.28 | 186.82 |
| 1993 | 263.07 | 199.10 |
| 1994 | 223.81 | 187.78 |
| 1995 | 227.55 | 183.14 |
| 1996 | 234.79 | 190.49 |
| 1997 | 234.02 | 193.02 |
| 1998 | 255.33 | 192.48 |
| 1999 | 196.93 | 200.18 |
| 2000 | 197.63 | 208.85 |
| 2001 | 190.52 | 232.26 |
| 2002 | 224.55 | 229.36 |
| 2003 | 218.83 | 216.14 |
| 2004 | 230.40 | 237.19 |
| 2005 | 218.55 | 275.47 |
| 2006 | 214.73 | 286.51 |
| 2007 | 168.31 | 269.17 |
| 2008 | 152.40 | 257.51 |
| 2009 | 150.14 | 237.16 |
| 2010 | 173.18 | 224.18 |
|
|