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Loading...
| year | production | consumption |
| 1980 | .20 | .20 |
| 1981 | .00 | .00 |
| 1982 | 1.00 | .00 |
| 1983 | 1.00 | .00 |
| 1984 | 16.00 | 29.00 |
| 1985 | 15.00 | 30.00 |
| 1986 | 17.00 | 33.00 |
| 1987 | 19.00 | 38.00 |
| 1988 | 22.00 | 42.00 |
| 1989 | 22.00 | 46.00 |
| 1990 | 22.00 | 51.00 |
| 1991 | 21.00 | 54.00 |
| 1992 | 21.00 | 59.00 |
| 1993 | 23.00 | 67.00 |
| 1994 | 23.00 | 66.00 |
| 1995 | 25.00 | 75.00 |
| 1996 | 25.00 | 80.00 |
| 1997 | 25.00 | 91.00 |
| 1998 | 25.00 | 101.00 |
| 1999 | 23.00 | 107.00 |
| 2000 | 22.00 | 143.00 |
| 2001 | 23.00 | 121.00 |
| 2002 | 24.00 | 114.00 |
| 2003 | 24.00 | 112.00 |
| 2004 | 24.00 | 124.00 |
| 2005 | 24.00 | 132.00 |
| 2006 | 26.00 | 111.00 |
| 2007 | 24.00 | 109.00 |
| 2008 | 25.00 | 107.00 |
| 2009 | 19.00 | 115.00 |
| 2010 | 21.00 | 117.00 |
| 2011 | 23.00 | 117.00 |
| 2012 | 25.00 | 115.00 |
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