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Loading...
| year | production | consumption |
| 1980 | 4.50 | 180.00 |
| 1981 | 4.20 | 166.00 |
| 1982 | 3.00 | 180.00 |
| 1983 | 3.50 | 184.00 |
| 1984 | 3.00 | 181.00 |
| 1985 | 4.00 | 219.00 |
| 1986 | 5.00 | 225.00 |
| 1987 | 4.40 | 223.00 |
| 1988 | .40 | 221.00 |
| 1989 | .40 | 223.00 |
| 1990 | .50 | 241.00 |
| 1991 | .30 | 200.00 |
| 1992 | .30 | 186.00 |
| 1993 | 2.50 | 172.00 |
| 1994 | 2.10 | 168.00 |
| 1995 | 1.80 | 208.00 |
| 1996 | 1.40 | 219.00 |
| 1997 | 1.40 | 182.00 |
| 1998 | 1.10 | 135.00 |
| 1999 | .70 | 119.00 |
| 2000 | 2.10 | 193.00 |
| 2001 | .10 | 205.00 |
| 2002 | .07 | 173.00 |
| 2003 | .07 | 191.00 |
| 2004 | .04 | 187.00 |
| 2005 | .00 | 191.00 |
| 2006 | .00 | 198.00 |
| 2007 | 11.00 | 118.00 |
| 2008 | 3.90 | 113.00 |
| 2009 | .40 | 73.00 |
| 2010 | 1.80 | 90.00 |
| 2011 | 15.00 | 103.00 |
| 2012 | 2.80 | 108.00 |
| 2013 | 9.80 | 105.00 |
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