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Loading...
| year | production | consumption |
| 1980 | .00 | 14.00 |
| 1981 | .00 | 12.00 |
| 1982 | .00 | 11.00 |
| 1983 | .00 | 8.00 |
| 1984 | .00 | 6.70 |
| 1985 | 1.00 | 8.60 |
| 1986 | 2.00 | 8.50 |
| 1987 | 2.00 | 7.20 |
| 1988 | 3.00 | 7.90 |
| 1989 | 4.00 | 8.70 |
| 1990 | 3.90 | 11.00 |
| 1991 | 3.50 | 9.70 |
| 1992 | 5.00 | 9.20 |
| 1993 | 5.00 | 9.60 |
| 1994 | 6.00 | 9.40 |
| 1995 | 7.00 | 9.70 |
| 1996 | 7.50 | 9.50 |
| 1997 | 5.00 | 9.80 |
| 1998 | 7.00 | 9.90 |
| 1999 | 10.00 | 9.90 |
| 2000 | 10.00 | 10.00 |
| 2001 | 10.00 | 11.00 |
| 2002 | 10.00 | 11.00 |
| 2003 | 10.00 | 12.00 |
| 2004 | 10.00 | 12.00 |
| 2005 | 10.00 | 13.00 |
| 2006 | 12.00 | 13.00 |
| 2007 | 14.00 | 13.00 |
| 2008 | 16.00 | 13.00 |
| 2009 | 16.00 | 13.00 |
| 2010 | 16.00 | 17.00 |
| 2011 | 16.00 | 17.00 |
| 2012 | 16.00 | 17.00 |
| 2013 | 15.00 | 17.00 |
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