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Loading...
| year | production | consumption |
| 1980 | 2.10 | 2.10 |
| 1981 | 2.00 | .00 |
| 1982 | 2.00 | .00 |
| 1983 | 2.00 | .00 |
| 1984 | 81.00 | 91.00 |
| 1985 | 61.00 | 93.00 |
| 1986 | 69.00 | 91.00 |
| 1987 | 75.00 | 98.00 |
| 1988 | 73.00 | 79.00 |
| 1989 | 83.00 | 77.00 |
| 1990 | 86.00 | 89.00 |
| 1991 | 81.00 | 88.00 |
| 1992 | 86.00 | 81.00 |
| 1993 | 87.00 | 74.00 |
| 1994 | 99.00 | 62.00 |
| 1995 | 101.00 | 62.00 |
| 1996 | 119.00 | 57.00 |
| 1997 | 121.00 | 66.00 |
| 1998 | 116.00 | 68.00 |
| 1999 | 123.00 | 65.00 |
| 2000 | 117.00 | 67.00 |
| 2001 | 126.00 | 61.00 |
| 2002 | 148.00 | 65.00 |
| 2003 | 152.00 | 64.00 |
| 2004 | 161.00 | 69.00 |
| 2005 | 146.00 | 62.00 |
| 2006 | 129.00 | 52.00 |
| 2007 | 42.00 | 214.00 |
| 2008 | 42.00 | 194.00 |
| 2009 | 44.00 | 166.00 |
| 2010 | 45.00 | 175.00 |
| 2011 | 49.00 | 182.00 |
| 2012 | 49.00 | 172.00 |
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