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Loading...
| year | production | consumption |
| 1980 | 10.00 | 9.40 |
| 1981 | 11.00 | 10.00 |
| 1982 | 11.00 | 11.00 |
| 1983 | 13.00 | 12.00 |
| 1984 | 14.00 | 13.00 |
| 1985 | 15.00 | 14.00 |
| 1986 | 15.00 | 14.00 |
| 1987 | 16.00 | 15.00 |
| 1988 | 18.00 | 17.00 |
| 1989 | 21.00 | 19.00 |
| 1990 | 24.00 | 22.00 |
| 1991 | 27.00 | 24.00 |
| 1992 | 28.00 | 26.00 |
| 1993 | 33.00 | 29.00 |
| 1994 | 37.00 | 34.00 |
| 1995 | 43.00 | 39.00 |
| 1996 | 49.00 | 43.00 |
| 1997 | 55.00 | 51.00 |
| 1998 | 57.00 | 52.00 |
| 1999 | 62.00 | 56.00 |
| 2000 | 66.00 | 60.00 |
| 2001 | 67.00 | 61.00 |
| 2002 | 70.00 | 64.00 |
| 2003 | 75.00 | 68.00 |
| 2004 | 78.00 | 71.00 |
| 2005 | 78.00 | 69.00 |
| 2006 | 85.00 | 75.00 |
| 2007 | 92.00 | 82.00 |
| 2008 | 92.00 | 84.00 |
| 2009 | 109.00 | 103.00 |
| 2010 | 118.00 | 110.00 |
| 2011 | 122.00 | 110.00 |
| 2012 | 127.00 | 119.00 |
| 2013 | 131.00 | 125.00 |
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