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Loading...
| year | production | consumption |
| 1980 | .60 | .60 |
| 1981 | .30 | .30 |
| 1982 | .30 | .30 |
| 1983 | .30 | .30 |
| 1984 | .10 | .10 |
| 1985 | .20 | .20 |
| 1986 | .20 | .20 |
| 1987 | .80 | .80 |
| 1988 | .70 | .70 |
| 1989 | 1.10 | 1.10 |
| 1990 | 1.10 | 1.10 |
| 1991 | 1.20 | 1.20 |
| 1992 | 1.20 | 1.20 |
| 1993 | 1.30 | 1.30 |
| 1994 | 1.20 | 1.20 |
| 1995 | 1.40 | 1.40 |
| 1996 | 1.50 | 1.50 |
| 1997 | 26.00 | 26.00 |
| 1998 | 14.00 | 14.00 |
| 1999 | 18.00 | 18.00 |
| 2000 | 21.00 | 21.00 |
| 2001 | 11.00 | 11.00 |
| 2002 | 12.00 | 12.00 |
| 2003 | 13.00 | 13.00 |
| 2004 | 13.00 | 13.00 |
| 2005 | 14.00 | 14.00 |
| 2006 | 14.00 | 14.00 |
| 2007 | 21.00 | 21.00 |
| 2008 | 41.00 | 41.00 |
| 2009 | 41.00 | 41.00 |
| 2010 | 38.00 | 38.00 |
| 2011 | 36.00 | 36.00 |
| 2012 | 37.00 | 37.00 |
| 2013 | 37.00 | 37.00 |
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