|
| year | production | consumption |
| 1980 | 235.00 | 4.80 |
| 1981 | 163.00 | |
| 1982 | 154.00 | |
| 1983 | 162.00 | |
| 1984 | 160.00 | 5.60 |
| 1985 | 153.00 | 6.40 |
| 1986 | 166.00 | 5.49 |
| 1987 | 139.00 | 6.19 |
| 1988 | 137.00 | 6.29 |
| 1989 | 132.00 | 6.84 |
| 1990 | 150.00 | 7.39 |
| 1991 | 161.20 | 10.49 |
| 1992 | 165.27 | 7.14 |
| 1993 | 165.00 | 9.22 |
| 1994 | 167.21 | 10.58 |
| 1995 | 163.00 | 10.86 |
| 1996 | 155.40 | 12.63 |
| 1997 | 160.00 | 12.51 |
| 1998 | 157.40 | 12.26 |
| 1999 | 182.00 | 12.00 |
| 2000 | 193.00 | 12.05 |
| 2001 | 195.23 | 11.59 |
| 2002 | 163.00 | 11.47 |
| 2003 | 169.94 | 12.94 |
| 2004 | 178.17 | 12.95 |
| 2005 | 190.87 | 14.03 |
| 2006 | 198.24 | 14.09 |
| 2007 | 155.24 | 14.67 |
| 2008 | 133.49 | 16.34 |
| 2009 | 130.61 | 15.47 |
| 2010 | 136.16 | 16.28 |
| 2011 | 125.93 | 17.00 |
|
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