|
| year | production | consumption |
| 1984 | 77.64 | 78.54 |
| 1985 | 67.18 | 81.27 |
| 1986 | 76.46 | 81.98 |
| 1987 | 78.79 | 92.28 |
| 1988 | 69.69 | 97.28 |
| 1989 | 76.30 | 103.55 |
| 1990 | 74.29 | 106.97 |
| 1991 | 66.63 | 111.43 |
| 1992 | 77.17 | 111.39 |
| 1993 | 66.61 | 112.45 |
| 1994 | 76.09 | 114.95 |
| 1995 | 81.48 | 122.84 |
| 1996 | 97.02 | 132.73 |
| 1997 | 105.14 | 135.08 |
| 1998 | 113.31 | 142.72 |
| 1999 | 99.45 | 140.50 |
| 2000 | 115.10 | 144.34 |
| 2001 | 111.43 | 148.75 |
| 2002 | 114.94 | 153.84 |
| 2003 | 123.72 | 169.59 |
| 2004 | 109.43 | 154.10 |
| 2005 | 115.54 | 160.61 |
| 2006 | 132.91 | 163.73 |
| 2007 | 136.04 | 156.17 |
| 2008 | 134.38 | 148.65 |
| 2009 | 133.45 | 144.36 |
| 2010 | 141.50 | 128.56 |
|
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