|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | 21.03 | 23.30 |
| 1987 | 21.03 | 23.78 |
| 1988 | 18.00 | 20.80 |
| 1989 | 18.00 | 20.80 |
| 1990 | 22.08 | 24.89 |
| 1991 | 23.37 | 25.17 |
| 1992 | 17.95 | 24.94 |
| 1993 | 17.76 | 25.01 |
| 1994 | 17.53 | 28.63 |
| 1995 | 16.83 | 26.17 |
| 1996 | 8.16 | 20.63 |
| 1997 | 8.34 | 15.25 |
| 1998 | 17.32 | 9.59 |
| 1999 | 17.13 | 35.87 |
| 2000 | 21.02 | 39.67 |
| 2001 | 4.39 | 4.98 |
| 2002 | 4.42 | 5.00 |
| 2003 | 4.32 | 5.02 |
| 2004 | 4.38 | 4.92 |
| 2005 | 3.72 | 4.16 |
| 2006 | 2.85 | 3.18 |
| 2007 | 3.41 | 3.81 |
| 2008 | 3.53 | 3.90 |
| 2009 | 2.71 | 2.97 |
| 2010 | 2.62 | 2.85 |
|
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