|
| year | production | consumption |
| 1984 | 7.13 | 20.45 |
| 1985 | 7.30 | 19.47 |
| 1986 | 7.53 | 20.07 |
| 1987 | 6.88 | 19.29 |
| 1988 | 6.74 | 19.78 |
| 1989 | 7.67 | 19.93 |
| 1990 | 7.89 | 20.49 |
| 1991 | 7.72 | 20.95 |
| 1992 | 8.34 | 22.42 |
| 1993 | 8.49 | 22.06 |
| 1994 | 8.19 | 22.78 |
| 1995 | 8.84 | 24.01 |
| 1996 | 8.82 | 25.37 |
| 1997 | 10.53 | 27.21 |
| 1998 | 10.86 | 30.24 |
| 1999 | 10.07 | 32.74 |
| 2000 | 12.52 | 34.47 |
| 2001 | 15.42 | 35.91 |
| 2002 | 15.30 | 36.69 |
| 2003 | 14.79 | 36.64 |
| 2004 | 12.72 | 37.57 |
| 2005 | 15.84 | 39.63 |
| 2006 | 14.70 | 43.48 |
| 2007 | 13.64 | 42.30 |
| 2008 | 13.14 | 40.04 |
| 2009 | 10.14 | 36.67 |
| 2010 | 10.72 | 33.71 |
|
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