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Loading...
| year | production | consumption |
| 1980 | .00 | 53.00 |
| 1981 | .00 | 46.00 |
| 1982 | .00 | 39.00 |
| 1983 | .00 | 41.00 |
| 1984 | .00 | 35.00 |
| 1985 | .00 | 31.00 |
| 1986 | .00 | 31.00 |
| 1987 | .00 | 33.00 |
| 1988 | .00 | 38.00 |
| 1989 | .00 | 43.00 |
| 1990 | .00 | 46.00 |
| 1991 | .00 | 47.00 |
| 1992 | .00 | 51.00 |
| 1993 | .00 | 52.00 |
| 1994 | .00 | 55.00 |
| 1995 | .00 | 60.00 |
| 1996 | .00 | 62.00 |
| 1997 | .00 | 66.00 |
| 1998 | .00 | 67.00 |
| 1999 | .00 | 69.00 |
| 2000 | .00 | 66.00 |
| 2001 | .00 | 66.00 |
| 2002 | .00 | 68.00 |
| 2003 | .00 | 70.00 |
| 2004 | .00 | 71.00 |
| 2005 | .00 | 69.00 |
| 2006 | .00 | 78.00 |
| 2007 | .00 | 82.00 |
| 2008 | .00 | 80.00 |
| 2009 | .00 | 58.00 |
| 2010 | .00 | 51.00 |
| 2011 | .00 | 54.00 |
| 2012 | .00 | 52.00 |
| 2013 | .00 | 53.00 |
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