|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | 96.92 | 125.32 |
| 1987 | 172.43 | 139.20 |
| 1988 | 144.79 | 140.70 |
| 1989 | 156.62 | 139.10 |
| 1990 | 188.89 | 144.55 |
| 1991 | 197.91 | 151.16 |
| 1992 | 200.69 | 152.34 |
| 1993 | 266.97 | 160.05 |
| 1994 | 320.50 | 173.43 |
| 1995 | 287.79 | 172.15 |
| 1996 | 285.75 | 193.45 |
| 1997 | 282.17 | 189.16 |
| 1998 | 291.23 | 197.46 |
| 1999 | 287.19 | 207.48 |
| 2000 | 315.71 | 231.87 |
| 2001 | 295.32 | 234.21 |
| 2002 | 268.86 | 236.02 |
| 2003 | 294.63 | 251.95 |
| 2004 | 297.08 | 247.46 |
| 2005 | 308.03 | 244.81 |
| 2006 | 279.26 | 238.02 |
| 2007 | 299.41 | 247.20 |
| 2008 | 282.82 | 217.22 |
| 2009 | 270.07 | 256.07 |
| 2010 | 220.11 | 235.70 |
|
|