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Loading...
| year | production | consumption |
| 1980 | 14.00 | 13.00 |
| 1981 | 3.50 | 3.40 |
| 1982 | 3.10 | 2.80 |
| 1983 | 5.20 | 5.30 |
| 1984 | .70 | .40 |
| 1985 | .30 | .30 |
| 1986 | .20 | .40 |
| 1987 | .20 | .40 |
| 1988 | .20 | .50 |
| 1989 | .20 | .50 |
| 1990 | .40 | .70 |
| 1991 | .50 | .80 |
| 1992 | .40 | .70 |
| 1993 | .40 | 1.10 |
| 1994 | .40 | .90 |
| 1995 | .40 | .80 |
| 1996 | .50 | .80 |
| 1997 | 1.00 | .90 |
| 1998 | 1.50 | .80 |
| 1999 | 7.60 | 2.00 |
| 2000 | 9.60 | 4.10 |
| 2001 | 12.00 | 7.00 |
| 2002 | 13.00 | 5.80 |
| 2003 | 11.00 | 8.10 |
| 2004 | 12.00 | 8.80 |
| 2005 | 13.00 | 9.10 |
| 2006 | 15.00 | 9.50 |
| 2007 | 16.00 | 10.00 |
| 2008 | 15.00 | 9.30 |
| 2009 | 17.00 | 9.30 |
| 2010 | 16.00 | 10.00 |
| 2011 | 17.00 | 11.00 |
| 2012 | 15.00 | 11.00 |
| 2013 | 15.00 | 11.00 |
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