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| year | production | consumption |
| 1980 | 33.00 | 990.00 |
| 1981 | 25.00 | 941.00 |
| 1982 | 30.00 | 1,003.00 |
| 1983 | 58.00 | 1,011.00 |
| 1984 | 46.00 | 852.00 |
| 1985 | 44.00 | 858.00 |
| 1986 | 38.00 | 866.00 |
| 1987 | 34.00 | 895.00 |
| 1988 | 30.00 | 983.00 |
| 1989 | 21.00 | 981.00 |
| 1990 | 16.00 | 1,010.00 |
| 1991 | 22.00 | 1,068.00 |
| 1992 | 22.00 | 1,104.00 |
| 1993 | 18.00 | 1,053.00 |
| 1994 | 17.00 | 1,116.00 |
| 1995 | 13.00 | 1,187.00 |
| 1996 | 10.00 | 1,199.00 |
| 1997 | 7.60 | 1,266.00 |
| 1998 | 11.00 | 1,356.00 |
| 1999 | 6.10 | 1,396.00 |
| 2000 | 4.80 | 1,433.00 |
| 2001 | 7.10 | 1,492.00 |
| 2002 | 6.40 | 1,505.00 |
| 2003 | 6.60 | 1,542.00 |
| 2004 | 6.00 | 1,571.00 |
| 2005 | 3.10 | 1,607.00 |
| 2006 | 3.00 | 1,588.00 |
| 2007 | 2.70 | 1,611.00 |
| 2008 | 2.70 | 1,547.00 |
| 2009 | 2.30 | 1,468.00 |
| 2010 | 2.60 | 1,441.00 |
| 2011 | 2.20 | 1,385.00 |
| 2012 | 3.00 | 1,301.00 |
| 2013 | 7.30 | 1,208.00 |
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