|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | 41.97 | 19.48 |
| 1987 | 38.30 | 24.20 |
| 1988 | 38.62 | 35.06 |
| 1989 | 46.23 | 34.38 |
| 1990 | 50.22 | 35.26 |
| 1991 | 60.19 | 37.55 |
| 1992 | 51.31 | 30.43 |
| 1993 | 53.15 | 28.86 |
| 1994 | 55.31 | 27.65 |
| 1995 | 64.02 | 29.48 |
| 1996 | 64.72 | 13.94 |
| 1997 | 52.90 | 33.36 |
| 1998 | 31.88 | 21.30 |
| 1999 | 36.05 | 31.73 |
| 2000 | 26.96 | 33.48 |
| 2001 | 52.44 | 31.24 |
| 2002 | 49.83 | 27.11 |
| 2003 | 35.04 | 39.73 |
| 2004 | 35.25 | 16.41 |
| 2005 | 54.92 | 23.96 |
| 2006 | 49.09 | 22.25 |
| 2007 | 27.41 | 19.34 |
| 2008 | 31.06 | 15.84 |
| 2009 | 14.70 | 19.84 |
| 2010 | 24.57 | 25.90 |
|
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