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Loading...
| year | production | consumption |
| 1980 | .80 | 3.60 |
| 1981 | .50 | 3.40 |
| 1982 | .40 | 3.40 |
| 1983 | .30 | 3.60 |
| 1984 | .40 | 3.80 |
| 1985 | .30 | 3.80 |
| 1986 | .40 | 3.80 |
| 1987 | .40 | 3.90 |
| 1988 | .40 | 4.00 |
| 1989 | .40 | 4.10 |
| 1990 | .30 | 4.10 |
| 1991 | .20 | 4.30 |
| 1992 | .40 | 4.20 |
| 1993 | .40 | 4.40 |
| 1994 | .30 | 4.70 |
| 1995 | .10 | 5.00 |
| 1996 | .10 | 4.90 |
| 1997 | .06 | 5.20 |
| 1998 | .06 | 5.30 |
| 1999 | .09 | 5.50 |
| 2000 | .10 | 5.80 |
| 2001 | .60 | 6.20 |
| 2002 | 2.40 | 5.70 |
| 2003 | 2.30 | 6.00 |
| 2004 | 2.90 | 6.20 |
| 2005 | 2.80 | 6.00 |
| 2006 | 3.00 | 6.40 |
| 2007 | 2.70 | 6.60 |
| 2008 | 2.20 | 6.40 |
| 2009 | 2.60 | 5.90 |
| 2010 | 2.50 | 6.40 |
| 2011 | 2.00 | 6.30 |
| 2012 | 2.10 | 6.10 |
| 2013 | 1.30 | 6.10 |
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