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| year | production | consumption |
| 1986 | 2.60 | 2.40 |
| 1987 | 2.40 | 2.20 |
| 1988 | 2.20 | 2.00 |
| 1989 | 2.20 | 2.10 |
| 1990 | 3.50 | 2.10 |
| 1991 | 1.80 | 1.90 |
| 1992 | 2.10 | 2.00 |
| 1993 | 2.10 | 1.90 |
| 1994 | 2.00 | 2.00 |
| 1995 | 2.10 | 1.70 |
| 1996 | 3.40 | 1.70 |
| 1997 | 2.10 | 1.50 |
| 1998 | 2.10 | 1.00 |
| 1999 | 6.00 | .90 |
| 2000 | 8.20 | .80 |
| 2001 | 9.80 | 1.00 |
| 2002 | 9.50 | 1.10 |
| 2003 | 12.00 | .60 |
| 2004 | 19.00 | .40 |
| 2005 | 25.00 | 34.00 |
| 2006 | 18.00 | 17.00 |
| 2007 | 19.00 | 21.00 |
| 2008 | 3.20 | .30 |
| 2009 | 1.80 | .30 |
| 2010 | 8.00 | .20 |
| 2011 | 2.70 | .20 |
| 2012 | 1.40 | .20 |
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