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Loading...
| year | production | consumption |
| 1980 | .00 | 37.00 |
| 1981 | .00 | 44.00 |
| 1982 | .00 | 50.00 |
| 1983 | .00 | 53.00 |
| 1984 | .00 | 56.00 |
| 1985 | .00 | 58.00 |
| 1986 | 1.00 | 62.00 |
| 1987 | .50 | 66.00 |
| 1988 | .50 | 62.00 |
| 1989 | .20 | 62.00 |
| 1990 | .30 | 66.00 |
| 1991 | .30 | 63.00 |
| 1992 | .05 | 73.00 |
| 1993 | .03 | 72.00 |
| 1994 | .02 | 82.00 |
| 1995 | .03 | 85.00 |
| 1996 | .03 | 92.00 |
| 1997 | .04 | 88.00 |
| 1998 | .03 | 96.00 |
| 1999 | .04 | 96.00 |
| 2000 | .04 | 101.00 |
| 2001 | .04 | 99.00 |
| 2002 | .02 | 103.00 |
| 2003 | .02 | 106.00 |
| 2004 | .02 | 107.00 |
| 2005 | .02 | 112.00 |
| 2006 | .02 | 108.00 |
| 2007 | .02 | 104.00 |
| 2008 | .02 | 97.00 |
| 2009 | .02 | 98.00 |
| 2010 | .02 | 106.00 |
| 2011 | .02 | 127.00 |
| 2012 | .02 | 137.00 |
| 2013 | .02 | 134.00 |
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