|
| year | production | consumption |
| 1980 | 1,622.00 | 1,725.00 |
| 1981 | 1,811.00 | 1,590.00 |
| 1982 | 2,065.00 | 1,590.00 |
| 1983 | 2,291.00 | 1,531.00 |
| 1984 | 2,480.00 | 1,825.00 |
| 1985 | 2,530.00 | 1,617.00 |
| 1986 | 2,539.00 | 1,637.00 |
| 1987 | 2,406.00 | 1,611.00 |
| 1988 | 2,232.00 | 1,692.00 |
| 1989 | 1,802.00 | 1,731.00 |
| 1990 | 1,820.00 | 1,776.00 |
| 1991 | 1,797.00 | 1,803.00 |
| 1992 | 1,825.38 | 1,815.00 |
| 1993 | 1,915.12 | 1,829.00 |
| 1994 | 92.49 | 1,833.00 |
| 1995 | 101.02 | 1,816.00 |
| 1996 | 106.50 | 1,852.00 |
| 1997 | 103.00 | 1,810.00 |
| 1998 | 107.09 | 1,792.00 |
| 1999 | 87.00 | 1,811.00 |
| 2000 | 67.80 | 1,765.44 |
| 2001 | 63.24 | 1,746.99 |
| 2002 | 55.25 | 1,738.64 |
| 2003 | 46.00 | 1,758.76 |
| 2004 | 39.92 | 1,785.40 |
| 2005 | 34.19 | 1,820.29 |
| 2006 | 30.35 | 1,805.73 |
| 2007 | 26.32 | 1,752.86 |
| 2008 | 25.85 | 1,725.25 |
| 2009 | 24.46 | 1,641.35 |
| 2010 | 19.51 | 1,630.27 |
| 2011 | 14.52 | 1,607.88 |
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