|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | 23.49 | 31.00 |
| 1987 | 24.00 | 34.10 |
| 1988 | 26.33 | 37.88 |
| 1989 | 23.44 | 31.08 |
| 1990 | 32.96 | 33.00 |
| 1991 | 34.48 | 37.12 |
| 1992 | 32.52 | 32.23 |
| 1993 | 40.24 | 35.72 |
| 1994 | 33.86 | 34.74 |
| 1995 | 39.16 | 37.30 |
| 1996 | 47.52 | 37.11 |
| 1997 | 28.10 | 22.30 |
| 1998 | 16.58 | 21.58 |
| 1999 | 19.14 | 20.16 |
| 2000 | 14.15 | 26.89 |
| 2001 | 25.63 | 35.39 |
| 2002 | 24.93 | 33.19 |
| 2003 | 10.17 | 23.63 |
| 2004 | 9.31 | 19.94 |
| 2005 | 23.02 | 28.12 |
| 2006 | 11.88 | 36.53 |
| 2007 | 8.43 | 36.60 |
| 2008 | 12.73 | 16.86 |
| 2009 | 6.06 | 12.14 |
| 2010 | 12.37 | 44.39 |
|
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