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Loading...
| year | production | consumption |
| 1980 | 1.40 | 1.40 |
| 1981 | 1.00 | .00 |
| 1982 | 1.00 | .00 |
| 1983 | 1.00 | .00 |
| 1984 | 15.00 | 29.50 |
| 1985 | 16.00 | 36.70 |
| 1986 | 21.40 | 45.50 |
| 1987 | 21.90 | 52.10 |
| 1988 | 21.90 | 55.60 |
| 1989 | 23.00 | 58.70 |
| 1990 | 24.00 | 74.90 |
| 1991 | 33.00 | 77.20 |
| 1992 | 35.00 | 87.40 |
| 1993 | 46.00 | 96.40 |
| 1994 | 38.00 | 103.50 |
| 1995 | 102.00 | 104.60 |
| 1996 | 118.00 | 113.70 |
| 1997 | 46.00 | 116.60 |
| 1998 | 102.00 | 125.20 |
| 1999 | 50.00 | 117.00 |
| 2000 | 56.00 | 129.40 |
| 2001 | 56.00 | 128.00 |
| 2002 | 68.00 | 120.70 |
| 2003 | 52.00 | 123.80 |
| 2004 | 41.00 | 127.00 |
| 2005 | 52.00 | 142.20 |
| 2006 | 35.70 | 132.40 |
| 2007 | 50.00 | 131.80 |
| 2008 | 54.20 | 144.40 |
| 2009 | 44.30 | 172.30 |
| 2010 | 45.30 | 202.50 |
| 2011 | 44.30 | 216.40 |
| 2012 | 41.30 | 233.80 |
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