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Loading...
| year | production | consumption |
| 1980 | 20.00 | 19.00 |
| 1981 | 27.00 | 23.00 |
| 1982 | 33.00 | 29.00 |
| 1983 | 35.00 | 32.00 |
| 1984 | 40.00 | 38.00 |
| 1985 | 44.00 | 40.00 |
| 1986 | 48.00 | 47.00 |
| 1987 | 51.00 | 47.00 |
| 1988 | 57.00 | 52.00 |
| 1989 | 62.00 | 57.00 |
| 1990 | 65.00 | 61.00 |
| 1991 | 69.00 | 64.00 |
| 1992 | 74.00 | 68.00 |
| 1993 | 82.00 | 75.00 |
| 1994 | 91.00 | 85.00 |
| 1995 | 98.00 | 92.00 |
| 1996 | 101.00 | 95.00 |
| 1997 | 108.00 | 100.00 |
| 1998 | 115.00 | 108.00 |
| 1999 | 113.00 | 107.00 |
| 2000 | 119.00 | 109.00 |
| 2001 | 126.00 | 118.00 |
| 2002 | 133.00 | 123.00 |
| 2003 | 144.00 | 137.00 |
| 2004 | 150.00 | 137.00 |
| 2005 | 166.00 | 147.00 |
| 2006 | 171.00 | 157.00 |
| 2007 | 179.00 | 163.00 |
| 2008 | 192.00 | 174.00 |
| 2009 | 204.00 | 186.00 |
| 2010 | 226.00 | 204.00 |
| 2011 | 235.00 | 212.00 |
| 2012 | 255.00 | 232.00 |
| 2013 | 267.00 | 247.00 |
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