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| year | production | consumption |
| 1980 | .06 | 1.20 |
| 1981 | .10 | 1.20 |
| 1982 | .10 | 1.20 |
| 1983 | .20 | 1.30 |
| 1984 | .40 | 1.00 |
| 1985 | .60 | 1.10 |
| 1986 | .90 | 1.40 |
| 1987 | 2.00 | 21.00 |
| 1988 | 2.20 | 22.00 |
| 1989 | 2.20 | 20.00 |
| 1990 | 2.20 | 20.00 |
| 1991 | 2.20 | 20.00 |
| 1992 | 62.00 | 21.00 |
| 1993 | 51.00 | 12.00 |
| 1994 | 71.00 | 50.00 |
| 1995 | 75.00 | 57.00 |
| 1996 | 71.00 | 65.00 |
| 1997 | 60.00 | 78.00 |
| 1998 | 55.00 | 75.00 |
| 1999 | 55.00 | 73.00 |
| 2000 | 55.00 | 73.00 |
| 2001 | 93.00 | 60.00 |
| 2002 | 98.00 | 70.00 |
| 2003 | 73.00 | 46.00 |
| 2004 | 33.00 | 10.00 |
| 2005 | 94.00 | 41.00 |
| 2006 | 108.00 | 36.00 |
| 2007 | 116.00 | 33.00 |
| 2008 | 137.00 | 47.00 |
| 2009 | 54.00 | 24.00 |
| 2010 | 97.00 | 32.00 |
| 2011 | 120.00 | 36.00 |
| 2012 | 109.00 | 36.00 |
| 2013 | 115.00 | 110.00 |
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