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Loading...
| year | production | consumption |
| 1980 | .00 | 32.00 |
| 1981 | .00 | 26.00 |
| 1982 | .00 | 24.00 |
| 1983 | .00 | 23.00 |
| 1984 | .00 | 28.00 |
| 1985 | .00 | 35.00 |
| 1986 | .00 | 43.00 |
| 1987 | .00 | 57.00 |
| 1988 | .00 | 61.00 |
| 1989 | .00 | 81.00 |
| 1990 | .00 | 95.00 |
| 1991 | .00 | 100.00 |
| 1992 | .00 | 104.00 |
| 1993 | .00 | 108.00 |
| 1994 | .00 | 119.00 |
| 1995 | .00 | 123.00 |
| 1996 | .00 | 129.00 |
| 1997 | .00 | 127.00 |
| 1998 | .00 | 145.00 |
| 1999 | .00 | 145.00 |
| 2000 | .00 | 148.00 |
| 2001 | .00 | 161.00 |
| 2002 | .00 | 160.00 |
| 2003 | .00 | 177.00 |
| 2004 | .00 | 171.00 |
| 2005 | .00 | 157.00 |
| 2006 | .00 | 168.00 |
| 2007 | .00 | 162.00 |
| 2008 | .00 | 167.00 |
| 2009 | .00 | 151.00 |
| 2010 | .00 | 166.00 |
| 2011 | .00 | 145.00 |
| 2012 | .00 | 130.00 |
| 2013 | .10 | 124.00 |
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