|
| year | production | consumption |
| 1984 | | |
| 1985 | | |
| 1986 | 49.28 | 60.81 |
| 1987 | 57.92 | 79.56 |
| 1988 | 59.11 | 77.66 |
| 1989 | 63.47 | 91.77 |
| 1990 | 75.18 | 86.05 |
| 1991 | 68.68 | 82.20 |
| 1992 | 78.04 | 98.59 |
| 1993 | 80.94 | 87.88 |
| 1994 | 71.73 | 93.83 |
| 1995 | 80.11 | 105.29 |
| 1996 | 130.23 | 111.68 |
| 1997 | 129.62 | 129.45 |
| 1998 | 116.12 | 130.00 |
| 1999 | 113.36 | 115.64 |
| 2000 | 104.20 | 92.10 |
| 2001 | 92.14 | 87.01 |
| 2002 | 74.86 | 75.02 |
| 2003 | 74.41 | 69.12 |
| 2004 | 66.73 | 74.46 |
| 2005 | 66.61 | 60.88 |
| 2006 | 60.86 | 51.02 |
| 2007 | 57.90 | 52.28 |
| 2008 | 44.03 | 44.18 |
| 2009 | 30.83 | 42.14 |
| 2010 | 36.91 | 46.28 |
|
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