|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | 24.67 | 28.99 |
| 1987 | 19.02 | 27.91 |
| 1988 | 30.00 | 29.30 |
| 1989 | 28.59 | 28.68 |
| 1990 | 30.65 | 30.98 |
| 1991 | 30.83 | 31.73 |
| 1992 | 31.49 | 34.32 |
| 1993 | 29.34 | 31.39 |
| 1994 | 30.53 | 30.44 |
| 1995 | 28.76 | 29.35 |
| 1996 | 29.56 | 30.56 |
| 1997 | 29.86 | 32.22 |
| 1998 | 31.20 | 32.60 |
| 1999 | 15.92 | 29.70 |
| 2000 | 36.36 | 34.03 |
| 2001 | 31.19 | 34.71 |
| 2002 | 35.08 | 40.57 |
| 2003 | 35.87 | 41.86 |
| 2004 | 35.73 | 37.90 |
| 2005 | 32.41 | 38.84 |
| 2006 | 36.29 | 46.37 |
| 2007 | 29.93 | 46.88 |
| 2008 | 47.37 | 62.65 |
| 2009 | 37.04 | 39.71 |
| 2010 | 48.42 | 54.76 |
|
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