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Loading...
| year | production | consumption |
| 1980 | .50 | 527.00 |
| 1981 | .10 | 471.00 |
| 1982 | .30 | 402.00 |
| 1983 | .40 | 365.00 |
| 1984 | .20 | 346.00 |
| 1985 | .10 | 357.00 |
| 1986 | .07 | 371.00 |
| 1987 | .07 | 364.00 |
| 1988 | .05 | 350.00 |
| 1989 | .05 | 336.00 |
| 1990 | .05 | 336.00 |
| 1991 | .04 | 340.00 |
| 1992 | .02 | 371.00 |
| 1993 | .01 | 365.00 |
| 1994 | .08 | 390.00 |
| 1995 | .08 | 388.00 |
| 1996 | .00 | 413.00 |
| 1997 | .00 | 394.00 |
| 1998 | .00 | 401.00 |
| 1999 | .00 | 392.00 |
| 2000 | .00 | 362.00 |
| 2001 | .00 | 369.00 |
| 2002 | .00 | 373.00 |
| 2003 | .00 | 370.00 |
| 2004 | .00 | 368.00 |
| 2005 | .00 | 360.00 |
| 2006 | .00 | 354.00 |
| 2007 | .00 | 350.00 |
| 2008 | .00 | 337.00 |
| 2009 | .00 | 318.00 |
| 2010 | .00 | 336.00 |
| 2011 | .00 | 315.00 |
| 2012 | .00 | 300.00 |
| 2013 | .00 | 296.00 |
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