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| year | production | consumption |
| 1987 | 58.00 | 1.00 |
| 1988 | 61.00 | .60 |
| 1989 | 60.00 | .80 |
| 1990 | 63.00 | 1.00 |
| 1991 | 65.00 | 1.20 |
| 1992 | 64.00 | 3.10 |
| 1993 | 56.00 | 3.30 |
| 1994 | 61.00 | 4.00 |
| 1995 | 55.00 | 3.80 |
| 1996 | 62.00 | 3.30 |
| 1997 | 54.00 | 3.60 |
| 1998 | 57.00 | 3.40 |
| 1999 | 64.00 | 3.50 |
| 2000 | 61.00 | 3.50 |
| 2001 | 54.00 | 2.00 |
| 2002 | 52.00 | .00 |
| 2003 | 55.00 | .00 |
| 2004 | 50.00 | .20 |
| 2005 | 52.00 | 1.10 |
| 2006 | 51.00 | 4.10 |
| 2007 | 51.00 | 2.60 |
| 2009 | 51.00 | 1.20 |
| 2010 | 45.00 | 1.40 |
| 2011 | 50.00 | 1.40 |
| 2012 | 44.00 | 1.50 |
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