|
| year | production | consumption |
| 1984 | 58.16 | 81.81 |
| 1985 | 54.70 | 86.38 |
| 1986 | 58.29 | 89.33 |
| 1987 | 57.88 | 98.71 |
| 1988 | 62.18 | 104.05 |
| 1989 | 67.50 | 106.16 |
| 1990 | 77.35 | 96.17 |
| 1991 | 73.07 | 98.43 |
| 1992 | 81.87 | 98.49 |
| 1993 | 69.98 | 108.72 |
| 1994 | 72.94 | 105.39 |
| 1995 | 68.65 | 109.67 |
| 1996 | 67.86 | 111.53 |
| 1997 | 72.11 | 107.45 |
| 1998 | 72.62 | 108.24 |
| 1999 | 70.97 | 130.27 |
| 2000 | 77.05 | 127.75 |
| 2001 | 77.22 | 122.42 |
| 2002 | 77.13 | 117.78 |
| 2003 | 75.41 | 117.21 |
| 2004 | 78.76 | 110.60 |
| 2005 | 77.99 | 110.47 |
| 2006 | 73.48 | 102.81 |
| 2007 | 72.97 | 96.58 |
| 2008 | 71.57 | 99.74 |
| 2009 | 67.08 | 104.78 |
| 2010 | 69.02 | 105.13 |
|
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