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Loading...
| year | production | consumption |
| 1980 | 22.00 | 27.00 |
| 1981 | 23.00 | 28.00 |
| 1982 | 23.00 | 29.00 |
| 1983 | 24.00 | 30.00 |
| 1984 | 25.00 | 32.00 |
| 1985 | 25.00 | 32.00 |
| 1986 | 26.00 | 33.00 |
| 1987 | 28.00 | 35.00 |
| 1988 | 28.00 | 35.00 |
| 1989 | 28.00 | 35.00 |
| 1990 | 27.00 | 34.00 |
| 1991 | 28.00 | 32.00 |
| 1992 | 30.00 | 31.00 |
| 1993 | 31.00 | 29.00 |
| 1994 | 32.00 | 30.00 |
| 1995 | 32.00 | 30.00 |
| 1996 | 33.00 | 31.00 |
| 1997 | 34.00 | 31.00 |
| 1998 | 35.00 | 31.00 |
| 1999 | 36.00 | 32.00 |
| 2000 | 33.00 | 32.00 |
| 2001 | 34.00 | 33.00 |
| 2002 | 34.00 | 34.00 |
| 2003 | 32.00 | 35.00 |
| 2004 | 32.00 | 35.00 |
| 2005 | 34.00 | 36.00 |
| 2006 | 34.00 | 37.00 |
| 2007 | 38.00 | 38.00 |
| 2008 | 38.00 | 38.00 |
| 2009 | 34.00 | 36.00 |
| 2010 | 35.00 | 36.00 |
| 2011 | 34.00 | 37.00 |
| 2012 | 33.00 | 37.00 |
| 2013 | 29.00 | 37.00 |
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