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| year | production | consumption |
| 1980 | 1.10 | 1.10 |
| 1981 | 2.20 | 1.10 |
| 1982 | 2.20 | 1.10 |
| 1983 | 4.40 | 7.70 |
| 1984 | 3.30 | 11.00 |
| 1985 | 4.40 | 12.00 |
| 1986 | 4.40 | 3.30 |
| 1987 | 3.30 | 3.30 |
| 1988 | 3.30 | 3.30 |
| 1989 | 3.30 | 3.30 |
| 1990 | 4.40 | 4.40 |
| 1991 | 4.40 | 4.40 |
| 1992 | 4.40 | 4.40 |
| 1993 | 49.00 | 49.00 |
| 1994 | 51.00 | 39.00 |
| 1995 | 49.00 | 54.00 |
| 1996 | 63.00 | 85.00 |
| 1997 | 31.00 | 39.00 |
| 1998 | 50.00 | 50.00 |
| 1999 | 83.00 | 83.00 |
| 2000 | 87.00 | 87.00 |
| 2001 | 86.00 | 86.00 |
| 2002 | 87.00 | 87.00 |
| 2003 | 61.00 | 61.00 |
| 2004 | 72.00 | 72.00 |
| 2005 | 34.00 | 34.00 |
| 2006 | 20.00 | 20.00 |
| 2007 | 30.00 | 30.00 |
| 2008 | 17.00 | 17.00 |
| 2009 | 28.00 | .00 |
| 2010 | 52.00 | .00 |
| 2011 | 50.00 | 3.30 |
| 2012 | 106.00 | 87.00 |
| 2013 | 77.00 | 94.00 |
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