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| year | production | consumption |
| 1980 | .40 | .40 |
| 1981 | .00 | .00 |
| 1982 | .00 | .00 |
| 1983 | .00 | .00 |
| 1984 | 6.90 | 4.30 |
| 1985 | 6.20 | 4.10 |
| 1986 | 6.30 | 6.40 |
| 1987 | 7.20 | 7.10 |
| 1988 | 6.90 | 7.20 |
| 1989 | 6.80 | 6.70 |
| 1990 | 7.30 | 7.30 |
| 1991 | 6.90 | 6.90 |
| 1992 | 9.20 | 6.90 |
| 1993 | 12.00 | 7.60 |
| 1994 | 14.00 | 8.40 |
| 1995 | 15.00 | 9.40 |
| 1996 | 14.00 | 10.00 |
| 1997 | 16.00 | 13.00 |
| 1998 | 16.00 | 14.00 |
| 1999 | 15.00 | 13.00 |
| 2000 | 15.00 | 15.00 |
| 2001 | 17.00 | 14.00 |
| 2002 | 15.00 | 12.00 |
| 2003 | 15.00 | 17.00 |
| 2004 | 17.00 | 17.00 |
| 2005 | 16.00 | 17.00 |
| 2006 | 15.00 | 15.00 |
| 2007 | 16.00 | 19.00 |
| 2008 | 17.00 | 17.00 |
| 2009 | 17.00 | 22.00 |
| 2010 | 18.00 | 23.00 |
| 2011 | 22.00 | 25.00 |
| 2012 | 21.00 | 30.00 |
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