|
| year | production | consumption |
| 1984 | 55.15 | 72.92 |
| 1985 | 56.38 | 68.38 |
| 1986 | 61.12 | 71.97 |
| 1987 | 62.24 | 68.05 |
| 1988 | 61.21 | 69.93 |
| 1989 | 63.91 | 77.52 |
| 1990 | 54.74 | 71.47 |
| 1991 | 50.27 | 83.21 |
| 1992 | 71.21 | 87.77 |
| 1993 | 72.76 | 90.52 |
| 1994 | 74.34 | 99.92 |
| 1995 | 69.29 | 101.49 |
| 1996 | 72.33 | 105.46 |
| 1997 | 73.92 | 114.50 |
| 1998 | 93.72 | 115.71 |
| 1999 | 96.70 | 133.23 |
| 2000 | 101.75 | 115.55 |
| 2001 | 99.25 | 107.17 |
| 2002 | 93.02 | 97.84 |
| 2003 | 93.42 | 94.66 |
| 2004 | 93.76 | 95.03 |
| 2005 | 95.96 | 92.79 |
| 2006 | 98.05 | 95.93 |
| 2007 | 91.67 | 96.33 |
| 2008 | 89.95 | 96.90 |
| 2009 | 99.34 | 98.90 |
| 2010 | 98.02 | 98.09 |
|
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