|
| year | production | consumption |
| 1984 | 5.31 | 5.25 |
| 1985 | 5.33 | 5.39 |
| 1986 | 5.72 | 5.72 |
| 1987 | 8.78 | 8.55 |
| 1988 | | 7.87 |
| 1989 | 8.78 | 8.91 |
| 1990 | 4.57 | 4.57 |
| 1991 | 4.57 | 4.60 |
| 1992 | 4.95 | 4.62 |
| 1993 | 5.40 | 8.26 |
| 1994 | 6.23 | 12.45 |
| 1995 | 5.88 | 18.54 |
| 1996 | 5.22 | 23.89 |
| 1997 | 5.72 | 28.69 |
| 1998 | 7.09 | 30.88 |
| 1999 | 9.15 | 33.72 |
| 2000 | 9.22 | 34.92 |
| 2001 | 8.08 | 42.04 |
| 2002 | 8.04 | 51.70 |
| 2003 | 8.49 | 63.27 |
| 2004 | 8.20 | 70.36 |
| 2005 | 8.94 | 75.26 |
| 2006 | 8.99 | 78.60 |
| 2007 | 8.20 | 79.96 |
| 2008 | 9.70 | 78.32 |
| 2009 | 9.34 | 75.64 |
| 2010 | 13.41 | 80.78 |
|
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