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Loading...
| year | production | consumption |
| 1980 | .00 | 37.00 |
| 1981 | .00 | 40.00 |
| 1982 | .00 | 43.00 |
| 1983 | .00 | 47.00 |
| 1984 | .00 | 52.00 |
| 1985 | 1.00 | 55.00 |
| 1986 | 1.00 | 56.00 |
| 1987 | .30 | 60.00 |
| 1988 | .20 | 60.00 |
| 1989 | .10 | 66.00 |
| 1990 | .10 | 70.00 |
| 1991 | .10 | 79.00 |
| 1992 | .10 | 83.00 |
| 1993 | .07 | 87.00 |
| 1994 | .04 | 86.00 |
| 1995 | .00 | 95.00 |
| 1996 | .00 | 102.00 |
| 1997 | .00 | 99.00 |
| 1998 | .00 | 102.00 |
| 1999 | .00 | 106.00 |
| 2000 | .00 | 105.00 |
| 2001 | .00 | 109.00 |
| 2002 | .00 | 107.00 |
| 2003 | .00 | 113.00 |
| 2004 | .00 | 117.00 |
| 2005 | .00 | 120.00 |
| 2006 | .04 | 117.00 |
| 2007 | .00 | 114.00 |
| 2008 | .10 | 121.00 |
| 2009 | .10 | 116.00 |
| 2010 | .20 | 130.00 |
| 2011 | .30 | 115.00 |
| 2012 | .30 | 127.00 |
| 2013 | .50 | 133.00 |
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