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| year | production | consumption |
| 1980 | .00 | .00 |
| 1981 | .00 | .00 |
| 1982 | 1.00 | 1.00 |
| 1983 | 2.50 | 2.50 |
| 1984 | 1.40 | 1.40 |
| 1985 | 2.00 | 2.00 |
| 1986 | 16.00 | 16.00 |
| 1987 | 10.00 | 26.00 |
| 1988 | 3.00 | 43.00 |
| 1989 | 6.00 | 114.00 |
| 1990 | 7.50 | 122.00 |
| 1991 | 7.20 | 150.00 |
| 1992 | 7.00 | 164.00 |
| 1993 | 7.10 | 182.00 |
| 1994 | 7.00 | 192.00 |
| 1995 | 6.40 | 248.00 |
| 1996 | 7.30 | 290.00 |
| 1997 | 8.90 | 346.00 |
| 1998 | 20.00 | 366.00 |
| 1999 | 26.00 | 442.00 |
| 2000 | 23.00 | 524.00 |
| 2001 | 11.00 | 563.00 |
| 2002 | 13.00 | 621.00 |
| 2003 | 20.00 | 748.00 |
| 2004 | 24.00 | 793.00 |
| 2005 | 32.00 | 967.00 |
| 2006 | 32.00 | 1,101.00 |
| 2007 | 32.00 | 1,292.00 |
| 2008 | 36.00 | 1,294.00 |
| 2009 | 24.00 | 1,240.00 |
| 2010 | 24.00 | 1,346.00 |
| 2011 | 27.00 | 1,578.00 |
| 2012 | 22.00 | 1,598.00 |
| 2013 | 19.00 | 1,622.00 |
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