|
| year | production | consumption |
| 1984 | 56.22 | 78.07 |
| 1985 | 58.14 | 62.35 |
| 1986 | 132.11 | 126.46 |
| 1987 | 226.85 | 133.14 |
| 1988 | 235.66 | 128.00 |
| 1989 | 223.43 | 130.02 |
| 1990 | 253.93 | 150.32 |
| 1991 | 263.88 | 152.10 |
| 1992 | 283.14 | 156.62 |
| 1993 | 275.65 | 153.46 |
| 1994 | 269.57 | 141.29 |
| 1995 | 277.28 | 142.98 |
| 1996 | 212.88 | 141.50 |
| 1997 | 258.19 | 187.64 |
| 1998 | 247.42 | 183.01 |
| 1999 | 248.54 | 181.15 |
| 2000 | 250.08 | 190.45 |
| 2001 | 243.59 | 172.25 |
| 2002 | 253.76 | 187.21 |
| 2003 | 232.26 | 184.47 |
| 2004 | 209.69 | 161.63 |
| 2005 | 226.86 | 185.34 |
| 2006 | 217.06 | 163.49 |
| 2007 | 200.95 | 171.91 |
| 2008 | 201.10 | 180.37 |
| 2009 | 343.46 | 155.56 |
| 2010 | 216.13 | 149.82 |
|
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