|
| year | production | consumption |
| 1980 | 283.00 | 160.00 |
| 1981 | 264.00 | 165.00 |
| 1982 | 306.00 | 180.00 |
| 1983 | 365.00 | 192.00 |
| 1984 | 440.00 | 194.00 |
| 1985 | 440.00 | 194.00 |
| 1986 | 504.00 | 192.27 |
| 1987 | 497.00 | 197.30 |
| 1988 | 540.00 | 202.50 |
| 1989 | 585.00 | 220.07 |
| 1990 | 619.00 | 265.98 |
| 1991 | 646.00 | 281.53 |
| 1992 | 653.39 | 301.52 |
| 1993 | 640.00 | 335.95 |
| 1994 | 644.99 | 377.51 |
| 1995 | 682.49 | 399.16 |
| 1996 | 695.03 | 435.26 |
| 1997 | 700.00 | 469.34 |
| 1998 | 720.00 | 449.23 |
| 1999 | 693.00 | 454.32 |
| 2000 | 690.03 | 465.02 |
| 2001 | 659.21 | 475.10 |
| 2002 | 698.46 | 462.75 |
| 2003 | 737.86 | 479.86 |
| 2004 | 755.35 | 508.04 |
| 2005 | 631.07 | 521.85 |
| 2006 | 612.60 | 534.41 |
| 2007 | 588.22 | 544.94 |
| 2008 | 608.80 | 669.10 |
| 2009 | 577.87 | 585.09 |
| 2010 | 563.40 | 598.40 |
| 2011 | 513.72 | 547.00 |
|
|