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| year | production | consumption |
| 1980 | 750.00 | 700.00 |
| 1981 | 775.00 | 830.00 |
| 1982 | 810.00 | 802.00 |
| 1983 | 828.00 | 1,064.00 |
| 1984 | 924.00 | 1,057.00 |
| 1985 | 854.00 | 1,224.00 |
| 1986 | 854.00 | 1,613.00 |
| 1987 | 699.00 | 1,876.00 |
| 1988 | 701.00 | 1,823.00 |
| 1989 | 556.00 | 1,962.00 |
| 1990 | 580.00 | 1,955.00 |
| 1991 | 607.00 | 2,152.00 |
| 1992 | 635.00 | 1,835.00 |
| 1993 | 666.00 | 1,898.00 |
| 1994 | 717.00 | 2,072.00 |
| 1995 | 717.00 | 2,938.00 |
| 1996 | 558.00 | 3,452.00 |
| 1997 | 414.00 | 3,434.00 |
| 1998 | 297.00 | 3,792.00 |
| 1999 | 142.00 | 3,670.00 |
| 2000 | 34.00 | 4,429.00 |
| 2001 | 2.20 | 5,623.00 |
| 2002 | .00 | 5,763.00 |
| 2003 | .00 | 5,390.00 |
| 2004 | 26.00 | 5,132.00 |
| 2005 | 13.00 | 5,443.00 |
| 2006 | 4.40 | 5,430.00 |
| 2007 | .00 | 5,532.00 |
| 2008 | .00 | 4,919.00 |
| 2009 | .00 | 4,521.00 |
| 2010 | .00 | 4,664.00 |
| 2011 | .00 | 4,973.00 |
| 2012 | .00 | 5,051.00 |
| 2013 | .00 | 4,697.00 |
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