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Loading...
| year | production | consumption |
| 1980 | 64.00 | 57.00 |
| 1981 | 73.00 | 64.00 |
| 1982 | 80.00 | 70.00 |
| 1983 | 82.00 | 73.00 |
| 1984 | 87.00 | 77.00 |
| 1985 | 93.00 | 82.00 |
| 1986 | 97.00 | 85.00 |
| 1987 | 105.00 | 91.00 |
| 1988 | 110.00 | 95.00 |
| 1989 | 118.00 | 101.00 |
| 1990 | 117.00 | 100.00 |
| 1991 | 122.00 | 105.00 |
| 1992 | 126.00 | 108.00 |
| 1993 | 132.00 | 112.00 |
| 1994 | 142.00 | 121.00 |
| 1995 | 148.00 | 125.00 |
| 1996 | 156.00 | 133.00 |
| 1997 | 168.00 | 145.00 |
| 1998 | 174.00 | 149.00 |
| 1999 | 184.00 | 158.00 |
| 2000 | 194.00 | 168.00 |
| 2001 | 201.00 | 171.00 |
| 2002 | 205.00 | 174.00 |
| 2003 | 203.00 | 173.00 |
| 2004 | 221.00 | 185.00 |
| 2005 | 231.00 | 193.00 |
| 2006 | 237.00 | 197.00 |
| 2007 | 244.00 | 203.00 |
| 2008 | 249.00 | 207.00 |
| 2009 | 248.00 | 204.00 |
| 2010 | 257.00 | 212.00 |
| 2011 | 280.00 | 234.00 |
| 2012 | 279.00 | 234.00 |
| 2013 | 281.00 | 232.00 |
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