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| year | production | consumption |
| 1980 | 1.00 | 2.00 |
| 1981 | 1.00 | 1.00 |
| 1982 | 9.00 | 9.00 |
| 1983 | 4.00 | 4.00 |
| 1984 | 2.30 | .50 |
| 1985 | 8.90 | .60 |
| 1986 | 6.80 | .20 |
| 1987 | 3.90 | .40 |
| 1988 | 8.00 | .60 |
| 1989 | 3.20 | .50 |
| 1990 | 6.60 | .60 |
| 1991 | 3.30 | 2.10 |
| 1992 | 3.70 | 3.00 |
| 1993 | 3.80 | 2.60 |
| 1994 | 2.70 | 2.40 |
| 1995 | 2.90 | 1.20 |
| 1996 | 2.80 | .70 |
| 1997 | 4.50 | .30 |
| 1998 | 5.10 | .30 |
| 1999 | 3.70 | .20 |
| 2001 | 5.50 | .20 |
| 2002 | 5.70 | .20 |
| 2004 | 85.00 | .00 |
| 2005 | 87.00 | .00 |
| 2006 | 91.00 | .00 |
| 2007 | 88.00 | .00 |
| 2008 | 82.00 | .00 |
| 2010 | 117.00 | .00 |
| 2012 | 180.00 | .00 |
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