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| year | production | consumption |
| 1981 | .00 | .00 |
| 1982 | .00 | .00 |
| 1983 | .00 | .00 |
| 1984 | .50 | 4.60 |
| 1985 | .50 | 4.60 |
| 1986 | .80 | 4.10 |
| 1987 | .70 | 4.40 |
| 1988 | 1.00 | 4.20 |
| 1989 | 1.00 | 4.50 |
| 1990 | .90 | 4.30 |
| 1991 | .90 | 4.30 |
| 1992 | 1.10 | 4.20 |
| 1993 | .90 | 4.30 |
| 1994 | 1.00 | 4.40 |
| 1995 | 1.10 | 4.30 |
| 1996 | 1.20 | 4.10 |
| 1997 | 1.40 | 4.00 |
| 1998 | 1.40 | 4.20 |
| 1999 | 1.20 | 4.30 |
| 2000 | 1.50 | 4.50 |
| 2001 | 1.90 | 4.60 |
| 2002 | 1.90 | 4.40 |
| 2003 | 1.80 | 4.30 |
| 2004 | 1.70 | 4.50 |
| 2005 | 1.80 | 4.80 |
| 2006 | 1.60 | 5.50 |
| 2007 | 1.10 | 4.50 |
| 2008 | 1.00 | 4.70 |
| 2009 | 1.10 | 3.30 |
| 2010 | 1.80 | 4.20 |
| 2011 | 2.10 | 3.30 |
| 2012 | 2.30 | 2.60 |
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