|
| year | production | consumption |
| 1984 | 117.60 | 89.46 |
| 1985 | 78.90 | 81.20 |
| 1986 | 133.38 | 102.87 |
| 1987 | 139.34 | 102.08 |
| 1988 | 117.60 | 108.87 |
| 1989 | 101.63 | 103.58 |
| 1990 | 99.58 | 102.54 |
| 1991 | 128.68 | 115.54 |
| 1992 | 118.65 | 115.30 |
| 1993 | 116.58 | 113.90 |
| 1994 | 95.04 | 112.24 |
| 1995 | 87.01 | 102.48 |
| 1996 | 120.58 | 115.07 |
| 1997 | 131.55 | 123.81 |
| 1998 | 142.12 | 131.66 |
| 1999 | 121.82 | 111.22 |
| 2000 | 140.81 | 113.61 |
| 2001 | 123.95 | 117.15 |
| 2002 | 134.37 | 136.03 |
| 2003 | 153.54 | 160.60 |
| 2004 | 147.68 | 163.29 |
| 2005 | 142.14 | 164.76 |
| 2006 | 125.94 | 170.23 |
| 2007 | 130.77 | 187.73 |
| 2008 | 119.73 | 187.69 |
| 2009 | 94.33 | 139.41 |
| 2010 | 96.29 | 125.53 |
|
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