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| year | production | consumption |
| 1980 | .00 | 1.00 |
| 1981 | .00 | 2.00 |
| 1982 | .00 | 2.00 |
| 1983 | .00 | 2.00 |
| 1984 | .00 | 1.70 |
| 1985 | .00 | 1.60 |
| 1986 | .00 | 1.60 |
| 1987 | .00 | 2.10 |
| 1988 | .00 | 1.60 |
| 1989 | .00 | 1.90 |
| 1990 | .00 | 2.50 |
| 1991 | .00 | 2.70 |
| 1992 | .00 | 2.50 |
| 1993 | .00 | 2.90 |
| 1994 | .00 | 4.90 |
| 1995 | 1.60 | 6.70 |
| 1996 | 1.80 | 8.60 |
| 1997 | 3.80 | 9.30 |
| 1998 | 3.60 | 11.00 |
| 1999 | 3.70 | 14.00 |
| 2000 | 5.10 | 13.00 |
| 2001 | 5.20 | 15.00 |
| 2002 | 6.80 | 16.00 |
| 2003 | 6.80 | 17.00 |
| 2004 | 5.40 | 18.00 |
| 2005 | 5.20 | 19.00 |
| 2006 | 4.90 | 20.00 |
| 2007 | 4.40 | 19.00 |
| 2008 | 4.60 | 21.00 |
| 2009 | 4.30 | 22.00 |
| 2010 | 4.50 | 23.00 |
| 2011 | 2.60 | 17.00 |
| 2012 | 2.80 | 16.00 |
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