|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | 23.62 | 8.83 |
| 1987 | 19.50 | 9.39 |
| 1988 | 17.32 | 8.88 |
| 1989 | 14.86 | 8.84 |
| 1990 | 16.79 | 8.01 |
| 1991 | 17.86 | 9.08 |
| 1992 | 15.55 | 5.55 |
| 1993 | 21.75 | 6.43 |
| 1994 | 19.65 | 4.16 |
| 1995 | 18.67 | 4.98 |
| 1996 | 15.42 | 3.60 |
| 1997 | 16.66 | 7.20 |
| 1998 | 20.66 | 7.38 |
| 1999 | 32.27 | 7.38 |
| 2000 | 31.34 | 7.71 |
| 2001 | 35.34 | 8.42 |
| 2002 | 29.49 | 7.64 |
| 2003 | 28.42 | 7.92 |
| 2004 | 25.54 | 7.18 |
| 2005 | 31.55 | 8.02 |
| 2006 | 28.98 | 2.83 |
| 2007 | 29.75 | 10.58 |
| 2008 | 36.06 | 10.68 |
| 2009 | 31.60 | 11.12 |
| 2010 | 29.03 | 10.35 |
|
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