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| year | production | consumption |
| 1980 | .00 | 32.00 |
| 1981 | .00 | 33.00 |
| 1982 | .00 | 34.00 |
| 1983 | .20 | 30.00 |
| 1984 | .40 | 31.00 |
| 1985 | .50 | 32.00 |
| 1986 | .50 | 34.00 |
| 1987 | .50 | 34.00 |
| 1988 | .60 | 36.00 |
| 1989 | .50 | 38.00 |
| 1990 | .80 | 36.00 |
| 1991 | .70 | 38.00 |
| 1992 | .90 | 37.00 |
| 1993 | 1.00 | 40.00 |
| 1994 | 1.40 | 46.00 |
| 1995 | 1.10 | 51.00 |
| 1996 | 1.40 | 52.00 |
| 1997 | 1.60 | 56.00 |
| 1998 | 1.50 | 58.00 |
| 1999 | 1.40 | 67.00 |
| 2000 | 2.50 | 69.00 |
| 2001 | 3.40 | 81.00 |
| 2002 | 6.00 | 83.00 |
| 2003 | 6.00 | 84.00 |
| 2004 | 6.00 | 85.00 |
| 2005 | 6.00 | 87.00 |
| 2006 | 6.00 | 91.00 |
| 2007 | 6.00 | 91.00 |
| 2008 | 5.70 | 94.00 |
| 2009 | 5.00 | 101.00 |
| 2010 | 5.00 | 82.00 |
| 2011 | 5.00 | 104.00 |
| 2012 | 4.70 | 107.00 |
| 2013 | 4.00 | 109.00 |
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