|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | 24.39 | 26.61 |
| 1987 | 27.02 | 30.50 |
| 1988 | 38.79 | 37.85 |
| 1989 | 42.98 | 41.82 |
| 1990 | 36.53 | 37.18 |
| 1991 | 36.75 | 40.55 |
| 1992 | 42.42 | 44.77 |
| 1993 | 39.25 | 44.09 |
| 1994 | 44.32 | 49.84 |
| 1995 | 41.29 | 44.11 |
| 1996 | 40.79 | 43.85 |
| 1997 | 48.95 | 57.60 |
| 1998 | 45.69 | 54.43 |
| 1999 | 51.92 | 52.47 |
| 2000 | 47.35 | 58.95 |
| 2001 | 49.39 | 61.02 |
| 2002 | 47.50 | 60.32 |
| 2003 | 31.39 | 63.36 |
| 2004 | 45.35 | 65.29 |
| 2005 | 46.93 | 68.31 |
| 2006 | 41.58 | 65.84 |
| 2007 | 30.80 | 66.62 |
| 2008 | 37.18 | 84.72 |
| 2009 | 28.32 | 88.41 |
| 2010 | 46.13 | 86.75 |
|
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