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| year | production | consumption |
| 1980 | 28,688.00 | 30,362.00 |
| 1981 | 28,941.00 | 30,240.00 |
| 1982 | 29,144.00 | 31,314.00 |
| 1983 | 28,124.00 | 29,879.00 |
| 1984 | 27,927.00 | 30,015.00 |
| 1985 | 26,557.00 | 28,248.00 |
| 1986 | 25,751.00 | 27,969.00 |
| 1987 | 25,502.00 | 28,215.00 |
| 1988 | 23,306.00 | 26,044.00 |
| 1989 | 22,401.00 | 24,530.00 |
| 1990 | 19,654.00 | 22,382.00 |
| 1991 | 18,888.00 | 21,905.00 |
| 1992 | 17,465.00 | 20,251.00 |
| 1993 | 16,349.00 | 19,863.00 |
| 1994 | 15,525.00 | 18,500.00 |
| 1995 | 16,283.00 | 18,663.00 |
| 1996 | 16,820.00 | 19,223.00 |
| 1997 | 17,377.00 | 19,057.00 |
| 1998 | 16,169.00 | 18,303.00 |
| 1999 | 16,035.00 | 18,407.00 |
| 2000 | 15,469.00 | 16,725.00 |
| 2001 | 15,338.00 | 16,806.00 |
| 2002 | 14,360.00 | 15,492.00 |
| 2003 | 14,662.00 | 16,190.00 |
| 2004 | 12,392.00 | 14,850.00 |
| 2005 | 10,549.00 | 12,774.00 |
| 2006 | 10,970.00 | 13,263.00 |
| 2007 | 10,822.00 | 13,286.00 |
| 2008 | 10,366.00 | 13,048.00 |
| 2009 | 9,905.00 | 11,768.00 |
| 2010 | 10,045.00 | 12,113.00 |
| 2011 | 10,533.00 | 12,802.00 |
| 2012 | 10,240.00 | 12,573.00 |
| 2013 | 10,522.00 | 12,404.00 |
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