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Loading...
| year | production | consumption |
| 1980 | 3.00 | 1.00 |
| 1981 | 8.00 | 7.00 |
| 1982 | 7.00 | 7.00 |
| 1983 | 7.00 | 7.00 |
| 1984 | 6.20 | 5.80 |
| 1985 | 5.40 | 4.90 |
| 1986 | 5.00 | 4.50 |
| 1987 | 4.50 | 3.80 |
| 1988 | 4.10 | 3.30 |
| 1989 | 4.40 | 3.60 |
| 1990 | 6.10 | 3.30 |
| 1991 | 4.30 | 3.00 |
| 1992 | 5.50 | 3.60 |
| 1993 | 4.70 | 3.30 |
| 1994 | 4.80 | 2.50 |
| 1995 | 4.60 | 2.40 |
| 1996 | 9.10 | 2.40 |
| 1997 | 5.70 | 2.50 |
| 1998 | 4.10 | 2.00 |
| 1999 | 5.00 | 1.50 |
| 2000 | 4.10 | 1.90 |
| 2001 | 3.90 | 1.50 |
| 2002 | 4.90 | 2.00 |
| 2003 | 4.00 | 1.60 |
| 2004 | 3.10 | .90 |
| 2005 | 1.90 | .30 |
| 2006 | 2.00 | .30 |
| 2007 | 1.70 | .50 |
| 2008 | 1.40 | .40 |
| 2009 | 1.00 | .60 |
| 2010 | .40 | .30 |
| 2011 | .30 | .60 |
| 2012 | .20 | .40 |
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