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Loading...
| year | production | consumption |
| 1980 | .00 | .40 |
| 1981 | .00 | .40 |
| 1982 | .00 | .50 |
| 1983 | .00 | .50 |
| 1984 | .00 | .50 |
| 1985 | .00 | .60 |
| 1986 | .00 | .60 |
| 1987 | .00 | .60 |
| 1988 | .00 | .60 |
| 1989 | .00 | .80 |
| 1990 | .00 | .80 |
| 1991 | .10 | .90 |
| 1992 | 1.60 | .80 |
| 1993 | 4.50 | .90 |
| 1994 | 5.00 | .90 |
| 1995 | 5.00 | .90 |
| 1996 | 17.00 | .90 |
| 1997 | 52.00 | 1.00 |
| 1998 | 83.00 | 1.00 |
| 1999 | 102.00 | 1.00 |
| 2000 | 167.00 | 1.50 |
| 2001 | 181.00 | 1.10 |
| 2002 | 213.00 | 1.10 |
| 2003 | 206.00 | 1.20 |
| 2004 | 365.00 | 1.00 |
| 2005 | 363.00 | 1.10 |
| 2006 | 343.00 | 1.10 |
| 2007 | 345.00 | 1.70 |
| 2008 | 337.00 | 5.20 |
| 2009 | 322.00 | 3.10 |
| 2010 | 298.00 | 4.60 |
| 2011 | 278.00 | 4.90 |
| 2012 | 289.00 | 4.90 |
| 2013 | 270.00 | 4.90 |
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