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Loading...
| year | production | consumption |
| 1980 | .50 | .50 |
| 1981 | 1.00 | 1.00 |
| 1982 | 1.00 | 1.00 |
| 1983 | 1.00 | 1.00 |
| 1984 | 18.00 | 33.00 |
| 1985 | 20.00 | 39.00 |
| 1986 | 27.00 | 48.00 |
| 1987 | 30.00 | 58.00 |
| 1988 | 32.00 | 71.00 |
| 1989 | 30.00 | 83.00 |
| 1990 | 33.00 | 98.00 |
| 1991 | 35.00 | 118.00 |
| 1992 | 40.00 | 147.00 |
| 1993 | 40.00 | 163.00 |
| 1994 | 40.00 | 172.00 |
| 1995 | 44.00 | 181.00 |
| 1996 | 43.00 | 188.00 |
| 1997 | 57.00 | 192.00 |
| 1998 | 75.00 | 182.00 |
| 1999 | 83.00 | 207.00 |
| 2000 | 93.00 | 226.00 |
| 2001 | 108.00 | 226.00 |
| 2002 | 111.00 | 244.00 |
| 2003 | 105.00 | 233.00 |
| 2004 | 105.00 | 229.00 |
| 2005 | 102.00 | 238.00 |
| 2006 | 94.00 | 242.00 |
| 2007 | 93.00 | 267.00 |
| 2008 | 95.00 | 272.00 |
| 2009 | 96.00 | 277.00 |
| 2010 | 89.00 | 277.00 |
| 2011 | 55.00 | 272.00 |
| 2012 | 47.00 | 255.00 |
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