|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | 70.11 | 80.01 |
| 1987 | 69.55 | 81.81 |
| 1988 | 69.36 | 81.59 |
| 1989 | 93.92 | 68.78 |
| 1990 | 55.56 | 49.29 |
| 1991 | 26.59 | 31.41 |
| 1992 | 29.21 | 32.05 |
| 1993 | 31.88 | 29.27 |
| 1994 | 42.52 | 27.21 |
| 1995 | 52.43 | 30.36 |
| 1996 | 47.95 | 32.20 |
| 1997 | 41.72 | 25.99 |
| 1998 | 40.02 | 25.10 |
| 1999 | 42.02 | 26.63 |
| 2000 | 39.44 | 18.94 |
| 2001 | 30.02 | 18.40 |
| 2002 | 39.98 | 31.64 |
| 2003 | 38.41 | 29.78 |
| 2004 | 39.00 | 35.63 |
| 2005 | 46.32 | 39.57 |
| 2006 | 51.55 | 41.23 |
| 2007 | 53.38 | 40.14 |
| 2008 | 48.99 | 38.44 |
| 2009 | 43.11 | 38.98 |
| 2010 | 39.63 | 36.59 |
|
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