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| year | production | consumption |
| 1980 | 1.20 | 1.20 |
| 1981 | 1.00 | .00 |
| 1982 | 1.00 | .00 |
| 1983 | 1.00 | .00 |
| 1984 | 41.00 | 74.00 |
| 1985 | 47.00 | 78.00 |
| 1986 | 52.00 | 76.00 |
| 1987 | 52.00 | 79.00 |
| 1988 | 56.00 | 83.00 |
| 1989 | 57.00 | 76.00 |
| 1990 | 58.00 | 81.00 |
| 1991 | 59.00 | 91.00 |
| 1992 | 59.00 | 84.00 |
| 1993 | 51.00 | 79.00 |
| 1994 | 54.00 | 85.00 |
| 1995 | 58.00 | 80.00 |
| 1996 | 48.00 | 84.00 |
| 1997 | 52.00 | 80.00 |
| 1998 | 50.00 | 82.00 |
| 1999 | 50.00 | 81.00 |
| 2000 | 48.00 | 79.00 |
| 2001 | 50.00 | 74.00 |
| 2002 | 50.00 | 74.00 |
| 2003 | 38.00 | 73.00 |
| 2004 | 34.00 | 74.00 |
| 2005 | 33.00 | 72.00 |
| 2006 | 48.00 | 66.00 |
| 2007 | 46.00 | 65.00 |
| 2008 | 47.00 | 63.00 |
| 2009 | 44.00 | 58.00 |
| 2010 | 46.00 | 59.00 |
| 2011 | 46.00 | 53.00 |
| 2012 | 54.00 | 51.00 |
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