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Loading...
| year | production | consumption |
| 1980 | .30 | .30 |
| 1981 | .00 | .00 |
| 1982 | .00 | .00 |
| 1983 | .00 | .00 |
| 1984 | 3.30 | 31.00 |
| 1985 | 3.60 | 33.00 |
| 1986 | 3.40 | 26.00 |
| 1987 | 4.20 | 36.00 |
| 1988 | 4.20 | 34.00 |
| 1989 | 3.70 | 28.00 |
| 1990 | 7.60 | 36.00 |
| 1991 | 7.10 | 35.00 |
| 1992 | 7.60 | 32.00 |
| 1993 | 8.10 | 36.00 |
| 1994 | 10.00 | 36.00 |
| 1995 | 9.80 | 38.00 |
| 1996 | 12.00 | 37.00 |
| 1997 | 12.00 | 36.00 |
| 1998 | 11.00 | 36.00 |
| 1999 | 11.00 | 32.00 |
| 2000 | 11.00 | 36.00 |
| 2001 | 9.90 | 48.00 |
| 2002 | 10.00 | 48.00 |
| 2003 | 11.00 | 57.00 |
| 2004 | 9.00 | 47.00 |
| 2005 | 11.00 | 48.00 |
| 2006 | 12.00 | 51.00 |
| 2007 | 12.00 | 56.00 |
| 2008 | 10.00 | 48.00 |
| 2009 | 13.00 | 48.00 |
| 2010 | 13.00 | 49.00 |
| 2011 | 13.00 | 47.00 |
| 2012 | 14.00 | 47.00 |
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