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Loading...
| year | production | consumption |
| 1980 | 3.20 | 2.70 |
| 1981 | 3.50 | 3.00 |
| 1982 | 3.90 | 3.20 |
| 1983 | 4.10 | 3.30 |
| 1984 | 4.10 | 3.20 |
| 1985 | 4.70 | 3.80 |
| 1986 | 5.20 | 4.10 |
| 1987 | 5.30 | 4.20 |
| 1988 | 5.50 | 4.30 |
| 1989 | 5.60 | 4.30 |
| 1990 | 6.20 | 4.80 |
| 1991 | 6.80 | 5.20 |
| 1992 | 7.00 | 5.40 |
| 1993 | 7.30 | 5.50 |
| 1994 | 8.00 | 6.00 |
| 1995 | 8.20 | 6.10 |
| 1996 | 9.10 | 6.90 |
| 1997 | 9.40 | 6.90 |
| 1998 | 9.90 | 7.40 |
| 1999 | 10.00 | 7.60 |
| 2000 | 10.00 | 7.80 |
| 2001 | 11.00 | 8.00 |
| 2002 | 12.00 | 8.30 |
| 2003 | 11.00 | 8.60 |
| 2004 | 13.00 | 10.00 |
| 2005 | 12.00 | 10.00 |
| 2006 | 14.00 | 12.00 |
| 2007 | 17.00 | 14.00 |
| 2008 | 18.00 | 15.00 |
| 2009 | 18.00 | 16.00 |
| 2010 | 19.00 | 16.00 |
| 2011 | 20.00 | 18.00 |
| 2012 | 22.00 | 19.00 |
| 2013 | 22.00 | 20.00 |
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