|
| year | production | consumption |
| 1980 | 1,577.00 | 408.00 |
| 1981 | 1,605.00 | 455.00 |
| 1982 | 1,339.00 | 479.00 |
| 1983 | 1,343.00 | 470.00 |
| 1984 | 1,412.00 | 470.00 |
| 1985 | 1,325.00 | 465.00 |
| 1986 | 1,390.00 | 469.95 |
| 1987 | 1,343.00 | 493.35 |
| 1988 | 1,342.00 | 523.85 |
| 1989 | 1,409.00 | 583.00 |
| 1990 | 1,462.00 | 651.06 |
| 1991 | 1,592.00 | 694.62 |
| 1992 | 1,504.00 | 706.92 |
| 1993 | 1,511.38 | 764.90 |
| 1994 | 1,510.20 | 777.52 |
| 1995 | 1,502.69 | 807.31 |
| 1996 | 1,547.49 | 858.50 |
| 1997 | 1,520.00 | 942.27 |
| 1998 | 1,518.36 | 905.60 |
| 1999 | 1,472.00 | 963.73 |
| 2000 | 1,428.38 | 1,036.70 |
| 2001 | 1,340.00 | 1,077.01 |
| 2002 | 1,249.03 | 1,125.65 |
| 2003 | 1,155.37 | 1,142.67 |
| 2004 | 1,095.64 | 1,232.57 |
| 2005 | 1,066.75 | 1,279.15 |
| 2006 | 1,019.22 | 1,256.49 |
| 2007 | 963.21 | 1,226.94 |
| 2008 | 986.05 | 1,229.27 |
| 2009 | 969.08 | 1,300.89 |
| 2010 | 953.15 | 1,384.36 |
| 2011 | 917.92 | 1,119.00 |
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