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Loading...
| year | production | consumption |
| 1980 | 5.40 | 5.40 |
| 1981 | 5.00 | .00 |
| 1982 | 3.00 | .00 |
| 1983 | 3.00 | .00 |
| 1984 | 76.00 | 105.00 |
| 1985 | 84.00 | 109.00 |
| 1986 | 80.00 | 106.00 |
| 1987 | 79.00 | 114.00 |
| 1988 | 84.00 | 117.00 |
| 1989 | 80.00 | 124.00 |
| 1990 | 82.00 | 109.00 |
| 1991 | 86.00 | 126.00 |
| 1992 | 81.00 | 121.00 |
| 1993 | 87.00 | 112.00 |
| 1994 | 80.00 | 111.00 |
| 1995 | 79.00 | 103.00 |
| 1996 | 89.00 | 113.00 |
| 1997 | 95.00 | 110.00 |
| 1998 | 97.00 | 112.00 |
| 1999 | 80.00 | 116.00 |
| 2000 | 87.00 | 113.00 |
| 2001 | 87.00 | 117.00 |
| 2002 | 74.00 | 120.00 |
| 2003 | 92.00 | 111.00 |
| 2004 | 89.00 | 112.00 |
| 2005 | 88.00 | 110.00 |
| 2006 | 88.00 | 123.00 |
| 2007 | 83.00 | 127.00 |
| 2008 | 93.00 | 128.00 |
| 2009 | 80.00 | 123.00 |
| 2010 | 67.00 | 118.00 |
| 2011 | 60.00 | 110.00 |
| 2012 | 47.00 | 107.00 |
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