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Loading...
| year | production | consumption |
| 1980 | .00 | 1.90 |
| 1981 | .00 | 2.00 |
| 1982 | .00 | 2.20 |
| 1983 | .00 | 2.50 |
| 1984 | .00 | 2.80 |
| 1985 | .00 | 2.80 |
| 1986 | .00 | 2.90 |
| 1987 | .00 | 2.90 |
| 1988 | .00 | 3.00 |
| 1989 | .00 | 3.00 |
| 1990 | .00 | 3.00 |
| 1991 | .00 | 3.10 |
| 1992 | .00 | 3.20 |
| 1993 | .00 | 3.20 |
| 1994 | .00 | 3.30 |
| 1995 | .00 | 10.00 |
| 1996 | .00 | 11.00 |
| 1997 | .00 | 13.00 |
| 1998 | .00 | 16.00 |
| 1999 | .00 | 16.00 |
| 2000 | .00 | 17.00 |
| 2001 | .00 | 20.00 |
| 2002 | .00 | 22.00 |
| 2003 | .00 | 24.00 |
| 2004 | .00 | 26.00 |
| 2005 | .00 | 28.00 |
| 2006 | .00 | 31.00 |
| 2007 | .00 | 33.00 |
| 2008 | .00 | 34.00 |
| 2009 | .00 | 32.00 |
| 2010 | .00 | 26.00 |
| 2011 | .00 | 29.00 |
| 2012 | .00 | 29.00 |
| 2013 | .00 | 28.00 |
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