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Loading...
| year | production | consumption |
| 1981 | .10 | .10 |
| 1982 | .20 | .20 |
| 1983 | .30 | .30 |
| 1984 | .40 | .40 |
| 1985 | 1.10 | 1.10 |
| 1986 | 2.20 | 2.20 |
| 1987 | 1.10 | 1.10 |
| 1988 | 1.10 | 1.10 |
| 1989 | 1.10 | 1.10 |
| 1990 | 1.10 | 1.10 |
| 1991 | 1.10 | 1.10 |
| 1992 | 1.10 | 1.10 |
| 1993 | 1.10 | 1.10 |
| 1994 | 1.10 | 1.10 |
| 1995 | 26.00 | 26.00 |
| 1996 | 56.00 | 56.00 |
| 1997 | 105.00 | 105.00 |
| 1998 | 271.00 | 175.00 |
| 1999 | 454.00 | 239.00 |
| 2000 | 454.00 | 262.00 |
| 2001 | 416.00 | 192.00 |
| 2002 | 551.00 | 298.00 |
| 2003 | 495.00 | 306.00 |
| 2004 | 660.00 | 434.00 |
| 2005 | 686.00 | 438.00 |
| 2006 | 714.00 | 468.00 |
| 2007 | 1,144.00 | 504.00 |
| 2008 | 850.00 | 516.00 |
| 2009 | 968.00 | 551.00 |
| 2010 | 787.00 | 591.00 |
| 2011 | 748.00 | 607.00 |
| 2012 | 927.00 | 629.00 |
| 2013 | 857.00 | 380.00 |
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