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| year | production | consumption |
| 1980 | .80 | .80 |
| 1981 | 1.00 | 1.00 |
| 1982 | 1.00 | 1.00 |
| 1983 | 1.00 | 1.00 |
| 1984 | 5.30 | 5.20 |
| 1985 | 5.30 | 5.40 |
| 1986 | 5.70 | 5.70 |
| 1987 | 8.80 | 8.50 |
| 1988 | 8.00 | 7.90 |
| 1989 | 8.80 | 8.90 |
| 1990 | 4.60 | 4.60 |
| 1991 | 4.60 | 4.60 |
| 1992 | 5.00 | 4.60 |
| 1993 | 5.40 | 8.30 |
| 1994 | 6.20 | 12.00 |
| 1995 | 5.90 | 19.00 |
| 1996 | 5.20 | 24.00 |
| 1997 | 5.70 | 29.00 |
| 1998 | 7.10 | 31.00 |
| 1999 | 9.20 | 34.00 |
| 2000 | 9.20 | 35.00 |
| 2001 | 8.10 | 42.00 |
| 2002 | 8.00 | 52.00 |
| 2003 | 8.50 | 63.00 |
| 2004 | 8.20 | 70.00 |
| 2005 | 8.90 | 75.00 |
| 2006 | 9.00 | 80.00 |
| 2007 | 8.20 | 82.00 |
| 2008 | 9.70 | 81.00 |
| 2009 | 9.30 | 79.00 |
| 2010 | 13.00 | 78.00 |
| 2011 | 14.00 | 76.00 |
| 2012 | 17.00 | 75.00 |
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