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| year | production | consumption |
| 1980 | 23,062.00 | 22,559.00 |
| 1981 | 22,820.00 | 22,111.00 |
| 1982 | 21,588.00 | 20,803.00 |
| 1983 | 19,682.00 | 19,643.00 |
| 1984 | 21,262.00 | 20,914.00 |
| 1985 | 20,494.00 | 20,436.00 |
| 1986 | 19,807.00 | 19,231.00 |
| 1987 | 20,622.00 | 20,216.00 |
| 1988 | 21,582.00 | 21,265.00 |
| 1989 | 21,904.00 | 22,427.00 |
| 1990 | 22,562.00 | 22,470.00 |
| 1991 | 22,655.00 | 22,911.00 |
| 1992 | 23,239.00 | 23,783.00 |
| 1993 | 23,955.00 | 24,458.00 |
| 1994 | 25,062.00 | 25,011.00 |
| 1995 | 25,159.00 | 26,122.00 |
| 1996 | 25,629.00 | 26,629.00 |
| 1997 | 25,830.00 | 26,802.00 |
| 1998 | 26,266.00 | 26,328.00 |
| 1999 | 26,384.00 | 26,775.00 |
| 2000 | 26,966.00 | 27,722.00 |
| 2001 | 27,515.00 | 26,755.00 |
| 2002 | 26,893.00 | 27,693.00 |
| 2003 | 26,952.00 | 27,290.00 |
| 2004 | 26,326.00 | 27,397.00 |
| 2005 | 25,961.00 | 26,814.00 |
| 2006 | 26,550.00 | 26,840.00 |
| 2007 | 27,360.00 | 28,180.00 |
| 2008 | 27,899.00 | 28,343.00 |
| 2009 | 27,980.00 | 28,045.00 |
| 2010 | 28,521.00 | 29,501.00 |
| 2011 | 29,864.00 | 30,564.00 |
| 2012 | 30,774.00 | 31,661.00 |
| 2013 | 31,103.00 | 32,625.00 |
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