|
| year | production | consumption |
| 1980 | 46.00 | 314.00 |
| 1981 | 46.00 | 280.00 |
| 1982 | 50.00 | 327.00 |
| 1983 | 44.00 | 342.00 |
| 1984 | 41.00 | 343.00 |
| 1985 | 41.00 | 359.00 |
| 1986 | 46.00 | 388.00 |
| 1987 | 51.00 | 441.00 |
| 1988 | 50.00 | 436.00 |
| 1989 | 56.00 | 448.00 |
| 1990 | 73.00 | 477.00 |
| 1991 | 88.34 | 466.00 |
| 1992 | 83.53 | 492.00 |
| 1993 | 76.24 | 565.00 |
| 1994 | 72.40 | 542.00 |
| 1995 | 67.47 | 608.00 |
| 1996 | 67.18 | 634.00 |
| 1997 | 67.60 | 631.00 |
| 1998 | 65.25 | 629.00 |
| 1999 | 59.00 | 627.00 |
| 2000 | 52.68 | 666.88 |
| 2001 | 48.00 | 618.62 |
| 2002 | 46.67 | 657.73 |
| 2003 | 45.17 | 644.97 |
| 2004 | 42.42 | 661.37 |
| 2005 | 43.67 | 659.33 |
| 2006 | 42.16 | 677.59 |
| 2007 | 41.00 | 689.81 |
| 2008 | 41.58 | 677.69 |
| 2009 | 46.21 | 703.16 |
| 2010 | 48.34 | 674.85 |
| 2011 | 45.74 | 691.24 |
|
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