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Loading...
| year | production | consumption |
| 1980 | 1.00 | 89.00 |
| 1981 | 1.00 | 85.00 |
| 1982 | 1.00 | 88.00 |
| 1983 | 1.00 | 89.00 |
| 1984 | 1.00 | 85.00 |
| 1985 | 1.00 | 90.00 |
| 1986 | .50 | 94.00 |
| 1987 | .40 | 92.00 |
| 1988 | .40 | 99.00 |
| 1989 | .30 | 111.00 |
| 1990 | .30 | 117.00 |
| 1991 | .30 | 117.00 |
| 1992 | .20 | 130.00 |
| 1993 | .20 | 135.00 |
| 1994 | .20 | 148.00 |
| 1995 | .30 | 142.00 |
| 1996 | .30 | 137.00 |
| 1997 | .08 | 146.00 |
| 1998 | .10 | 144.00 |
| 1999 | .20 | 158.00 |
| 2000 | .30 | 158.00 |
| 2001 | .40 | 161.00 |
| 2002 | .30 | 164.00 |
| 2003 | .20 | 167.00 |
| 2004 | .20 | 170.00 |
| 2005 | .50 | 174.00 |
| 2006 | .50 | 181.00 |
| 2007 | .50 | 183.00 |
| 2008 | .50 | 216.00 |
| 2009 | .50 | 235.00 |
| 2010 | .50 | 268.00 |
| 2011 | .50 | 282.00 |
| 2012 | .50 | 291.00 |
| 2013 | .50 | 293.00 |
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