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Loading...
| year | production | consumption |
| 1980 | 23.00 | 22.00 |
| 1981 | 24.00 | 22.00 |
| 1982 | 26.00 | 25.00 |
| 1983 | 27.00 | 26.00 |
| 1984 | 31.00 | 30.00 |
| 1985 | 34.00 | 33.00 |
| 1986 | 36.00 | 32.00 |
| 1987 | 40.00 | 35.00 |
| 1988 | 46.00 | 40.00 |
| 1989 | 46.00 | 40.00 |
| 1990 | 55.00 | 48.00 |
| 1991 | 58.00 | 50.00 |
| 1992 | 65.00 | 56.00 |
| 1993 | 71.00 | 60.00 |
| 1994 | 75.00 | 63.00 |
| 1995 | 83.00 | 68.00 |
| 1996 | 91.00 | 75.00 |
| 1997 | 99.00 | 83.00 |
| 1998 | 106.00 | 89.00 |
| 1999 | 111.00 | 92.00 |
| 2000 | 119.00 | 99.00 |
| 2001 | 117.00 | 97.00 |
| 2002 | 123.00 | 103.00 |
| 2003 | 134.00 | 110.00 |
| 2004 | 144.00 | 120.00 |
| 2005 | 154.00 | 129.00 |
| 2006 | 168.00 | 141.00 |
| 2007 | 182.00 | 154.00 |
| 2008 | 188.00 | 160.00 |
| 2009 | 185.00 | 155.00 |
| 2010 | 201.00 | 170.00 |
| 2011 | 218.00 | 187.00 |
| 2012 | 228.00 | 195.00 |
| 2013 | 226.00 | 195.00 |
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