|
| year | production | consumption |
| 1984 | 327.98 | 135.48 |
| 1985 | 306.63 | 140.09 |
| 1986 | 403.58 | 148.76 |
| 1987 | 365.87 | 143.92 |
| 1988 | 375.61 | 150.26 |
| 1989 | 354.85 | 157.79 |
| 1990 | 319.72 | 150.51 |
| 1991 | 359.26 | 165.04 |
| 1992 | 373.33 | 166.78 |
| 1993 | 383.20 | 160.29 |
| 1994 | 391.74 | 161.64 |
| 1995 | 418.89 | 158.18 |
| 1996 | 435.25 | 158.82 |
| 1997 | 433.31 | 155.97 |
| 1998 | 434.36 | 164.04 |
| 1999 | 443.16 | 171.13 |
| 2000 | 448.27 | 177.76 |
| 2001 | 453.06 | 181.08 |
| 2002 | 400.22 | 183.15 |
| 2003 | 424.85 | 184.67 |
| 2004 | 412.36 | 186.93 |
| 2005 | 431.68 | 192.06 |
| 2006 | 402.37 | 199.03 |
| 2007 | 397.41 | 192.98 |
| 2008 | 420.53 | 194.53 |
| 2009 | 420.70 | 179.15 |
| 2010 | 435.75 | 188.98 |
|
|