|
| year | production | consumption |
| 1980 | 8.98 | 94.96 |
| 1981 | 9.93 | 52.92 |
| 1982 | 9.72 | 54.91 |
| 1983 | 10.02 | 56.31 |
| 1984 | 9.23 | 120.56 |
| 1985 | 8.27 | 96.46 |
| 1986 | 5.51 | 63.93 |
| 1987 | | 95.90 |
| 1988 | | 98.11 |
| 1989 | | 89.29 |
| 1990 | | 14.33 |
| 1991 | 2.20 | 76.06 |
| 1992 | 1.10 | 112.44 |
| 1993 | 2.20 | 66.14 |
| 1994 | 6.61 | 133.38 |
| 1995 | 6.61 | 136.69 |
| 1996 | 8.82 | 139.99 |
| 1997 | 17.64 | 148.81 |
| 1998 | 12.13 | 368.17 |
| 1999 | 19.84 | 461.87 |
| 2000 | 18.74 | 473.99 |
| 2001 | 11.02 | 542.34 |
| 2002 | 13.23 | 251.33 |
| 2003 | 12.13 | 320.77 |
| 2004 | 9.92 | 283.29 |
| 2005 | 13.23 | 455.25 |
| 2006 | 22.05 | 285.50 |
| 2007 | 15.43 | 361.56 |
| 2008 | 16.53 | 340.61 |
| 2009 | 16.53 | 354.94 |
| 2010 | 17.64 | 371.48 |
| 2011 | 17.64 | 371.48 |
|
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