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Loading...
| year | production | consumption |
| 1980 | 6.00 | 290.00 |
| 1981 | 15.00 | 243.00 |
| 1982 | 35.00 | 230.00 |
| 1983 | 45.00 | 219.00 |
| 1984 | 46.00 | 217.00 |
| 1985 | 58.00 | 224.00 |
| 1986 | 76.00 | 221.00 |
| 1987 | 97.00 | 214.00 |
| 1988 | 99.00 | 205.00 |
| 1989 | 117.00 | 196.00 |
| 1990 | 121.00 | 192.00 |
| 1991 | 143.00 | 194.00 |
| 1992 | 163.00 | 192.00 |
| 1993 | 174.00 | 199.00 |
| 1994 | 185.00 | 211.00 |
| 1995 | 186.00 | 223.00 |
| 1996 | 208.00 | 235.00 |
| 1997 | 230.00 | 227.00 |
| 1998 | 238.00 | 223.00 |
| 1999 | 300.00 | 220.00 |
| 2000 | 363.00 | 210.00 |
| 2001 | 346.00 | 213.00 |
| 2002 | 371.00 | 197.00 |
| 2003 | 375.00 | 188.00 |
| 2004 | 389.00 | 185.00 |
| 2005 | 377.00 | 183.00 |
| 2006 | 342.00 | 190.00 |
| 2007 | 312.00 | 191.00 |
| 2008 | 287.00 | 181.00 |
| 2009 | 260.00 | 167.00 |
| 2010 | 245.00 | 167.00 |
| 2011 | 221.00 | 164.00 |
| 2012 | 202.00 | 155.00 |
| 2013 | 175.00 | 155.00 |
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