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| year | production | consumption |
| 1980 | 1,790.60 | 2,176.00 |
| 1981 | 1,660.00 | 2,179.00 |
| 1982 | 1,412.00 | 1,787.00 |
| 1983 | 1,483.00 | 1,930.00 |
| 1984 | 1,468.50 | 1,407.10 |
| 1985 | 1,420.70 | 1,458.20 |
| 1986 | 1,733.20 | 1,686.20 |
| 1987 | 1,801.90 | 1,718.50 |
| 1988 | 1,933.00 | 1,787.60 |
| 1989 | 2,122.10 | 1,897.00 |
| 1990 | 2,094.20 | 1,857.50 |
| 1991 | 2,333.90 | 2,203.10 |
| 1992 | 3,408.40 | 3,273.40 |
| 1993 | 3,164.00 | 2,873.40 |
| 1994 | 3,306.90 | 2,933.80 |
| 1995 | 3,221.30 | 3,005.60 |
| 1996 | 3,211.10 | 3,099.20 |
| 1997 | 3,389.90 | 3,240.00 |
| 1998 | 3,318.40 | 3,246.80 |
| 1999 | 3,403.20 | 3,253.10 |
| 2000 | 3,579.30 | 3,394.20 |
| 2001 | 3,677.50 | 3,502.00 |
| 2002 | 3,609.20 | 3,417.50 |
| 2003 | 3,775.70 | 3,566.40 |
| 2004 | 3,891.50 | 3,778.20 |
| 2005 | 3,856.00 | 3,802.60 |
| 2006 | 3,803.00 | 3,801.30 |
| 2007 | 3,581.10 | 3,684.80 |
| 2008 | 3,522.60 | 3,626.80 |
| 2009 | 3,406.20 | 3,481.90 |
| 2010 | 3,659.90 | 3,696.40 |
| 2011 | 3,695.00 | 3,585.30 |
| 2012 | 3,569.90 | 3,570.80 |
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