|
| year | production | consumption |
| 1980 | | 387.00 |
| 1981 | | 346.00 |
| 1982 | | 318.00 |
| 1983 | | 325.00 |
| 1984 | | 314.00 |
| 1985 | | 317.00 |
| 1986 | | 331.00 |
| 1987 | | 340.00 |
| 1988 | | 340.00 |
| 1989 | | 345.00 |
| 1990 | | 280.00 |
| 1991 | | 271.00 |
| 1992 | 3.16 | 279.00 |
| 1993 | 4.93 | 293.00 |
| 1994 | | 304.00 |
| 1995 | 4.60 | 318.00 |
| 1996 | | 361.00 |
| 1997 | | 391.00 |
| 1998 | 7.38 | 404.00 |
| 1999 | | 420.00 |
| 2000 | 13.01 | 411.26 |
| 2001 | 14.73 | 404.69 |
| 2002 | 13.32 | 406.43 |
| 2003 | 14.64 | 430.67 |
| 2004 | 16.66 | 454.14 |
| 2005 | 15.90 | 470.41 |
| 2006 | 14.99 | 500.29 |
| 2007 | 13.66 | 520.64 |
| 2008 | 14.17 | 534.08 |
| 2009 | 12.41 | 537.67 |
| 2010 | 12.91 | 560.00 |
| 2011 | 12.49 | 578.69 |
|
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