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| year | production | consumption |
| 1980 | 2.00 | 16.00 |
| 1981 | 2.00 | 14.00 |
| 1982 | 2.00 | 16.00 |
| 1983 | 2.00 | 14.00 |
| 1984 | 2.00 | 16.00 |
| 1985 | 1.00 | 14.00 |
| 1986 | .30 | 16.00 |
| 1987 | .00 | 18.00 |
| 1988 | .00 | 21.00 |
| 1989 | .00 | 24.00 |
| 1990 | .00 | 20.00 |
| 1991 | .00 | 20.00 |
| 1992 | 1.10 | 22.00 |
| 1993 | 1.60 | 23.00 |
| 1994 | 1.40 | 26.00 |
| 1995 | 4.00 | 27.00 |
| 1996 | 6.00 | 27.00 |
| 1997 | 5.00 | 26.00 |
| 1998 | 5.00 | 27.00 |
| 1999 | 6.00 | 31.00 |
| 2000 | 7.00 | 37.00 |
| 2001 | 7.00 | 36.00 |
| 2002 | 7.00 | 39.00 |
| 2003 | 7.00 | 42.00 |
| 2004 | 7.00 | 45.00 |
| 2005 | 6.00 | 46.00 |
| 2006 | 6.00 | 47.00 |
| 2007 | 6.00 | 48.00 |
| 2008 | 6.00 | 44.00 |
| 2009 | 6.00 | 54.00 |
| 2010 | 7.20 | 65.00 |
| 2011 | 77.00 | 69.00 |
| 2012 | 78.00 | 78.00 |
| 2013 | 98.00 | 75.00 |
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