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Loading...
| year | production | consumption |
| 1980 | 35.00 | 160.00 |
| 1981 | 36.00 | 163.00 |
| 1982 | 1.00 | 162.00 |
| 1983 | 1.00 | 151.00 |
| 1984 | 1.00 | 126.00 |
| 1985 | 1.00 | 132.00 |
| 1986 | 1.00 | 143.00 |
| 1987 | .30 | 158.00 |
| 1988 | .40 | 168.00 |
| 1989 | .30 | 173.00 |
| 1990 | .20 | 179.00 |
| 1991 | .20 | 180.00 |
| 1992 | .20 | 181.00 |
| 1993 | .20 | 199.00 |
| 1994 | .10 | 212.00 |
| 1995 | .10 | 228.00 |
| 1996 | .20 | 221.00 |
| 1997 | .30 | 230.00 |
| 1998 | .20 | 228.00 |
| 1999 | .20 | 235.00 |
| 2000 | .08 | 252.00 |
| 2001 | .08 | 234.00 |
| 2002 | .10 | 247.00 |
| 2003 | .06 | 255.00 |
| 2004 | .08 | 248.00 |
| 2005 | .10 | 233.00 |
| 2006 | .10 | 242.00 |
| 2007 | .10 | 251.00 |
| 2008 | .10 | 246.00 |
| 2009 | .10 | 233.00 |
| 2010 | .10 | 251.00 |
| 2011 | .40 | 248.00 |
| 2012 | .40 | 292.00 |
| 2013 | .40 | 241.00 |
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