|
| year | production | consumption |
| 1980 | | |
| 1981 | | |
| 1982 | | |
| 1983 | | |
| 1984 | | |
| 1985 | | |
| 1986 | | |
| 1987 | | |
| 1988 | | |
| 1989 | | |
| 1990 | | |
| 1991 | | |
| 1992 | 275.46 | 522.66 |
| 1993 | 240.14 | 388.47 |
| 1994 | 225.31 | 331.96 |
| 1995 | 231.99 | 317.84 |
| 1996 | 236.61 | 328.43 |
| 1997 | 210.48 | 323.49 |
| 1998 | 197.41 | 197.41 |
| 1999 | 211.89 | 211.89 |
| 2000 | 199.88 | 199.88 |
| 2001 | 202.00 | 237.32 |
| 2002 | 181.87 | 319.95 |
| 2003 | 181.17 | 324.90 |
| 2004 | 176.93 | 351.03 |
| 2005 | 205.53 | 366.57 |
| 2006 | 240.85 | 399.06 |
| 2007 | 380.45 | 327.51 |
| 2008 | 591.49 | 423.96 |
| 2009 | 576.59 | 367.17 |
| 2010 | 588.91 | 350.36 |
| 2011 | 630.73 | 443.56 |
|
|