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| year | production | consumption |
| 1980 | 10,534.00 | 10,591.00 |
| 1981 | 10,394.00 | 10,624.00 |
| 1982 | 10,274.00 | 10,560.00 |
| 1983 | 10,380.00 | 10,602.00 |
| 1984 | 10,513.10 | 10,657.00 |
| 1985 | 10,649.30 | 10,826.30 |
| 1986 | 15,118.50 | 15,359.20 |
| 1987 | 15,872.40 | 15,745.20 |
| 1988 | 16,331.10 | 16,339.70 |
| 1989 | 16,170.60 | 16,309.00 |
| 1990 | 16,635.30 | 16,492.40 |
| 1991 | 17,104.40 | 17,230.20 |
| 1992 | 17,206.50 | 17,154.00 |
| 1993 | 17,793.00 | 17,446.80 |
| 1994 | 17,679.30 | 17,670.30 |
| 1995 | 18,155.20 | 17,981.50 |
| 1996 | 18,600.00 | 18,253.10 |
| 1997 | 19,030.00 | 18,580.20 |
| 1998 | 19,330.00 | 18,991.90 |
| 1999 | 19,303.70 | 19,312.30 |
| 2000 | 19,610.50 | 19,773.40 |
| 2001 | 19,767.90 | 19,961.20 |
| 2002 | 20,032.50 | 20,079.80 |
| 2003 | 20,238.20 | 20,287.40 |
| 2004 | 20,758.90 | 20,746.00 |
| 2005 | 21,087.40 | 21,024.50 |
| 2006 | 21,018.20 | 21,336.40 |
| 2007 | 21,005.80 | 21,587.90 |
| 2008 | 21,183.70 | 21,329.00 |
| 2009 | 22,010.30 | 21,612.30 |
| 2010 | 22,107.40 | 22,031.90 |
| 2011 | 22,079.20 | 22,079.00 |
| 2012 | 22,377.20 | 22,441.50 |
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