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Loading...
| year | production | consumption |
| 1980 | 5.00 | 5.00 |
| 1981 | 4.00 | 4.00 |
| 1982 | 3.00 | 4.00 |
| 1983 | 3.00 | 4.00 |
| 1984 | 2.40 | 3.20 |
| 1985 | 2.10 | 2.50 |
| 1986 | 58.30 | 59.90 |
| 1987 | 56.10 | 63.60 |
| 1988 | 62.00 | 62.20 |
| 1989 | 57.50 | 57.70 |
| 1990 | 105.90 | 92.30 |
| 1991 | 102.90 | 91.40 |
| 1992 | 100.80 | 83.10 |
| 1993 | 94.00 | 91.20 |
| 1994 | 99.50 | 91.20 |
| 1995 | 97.50 | 94.30 |
| 1996 | 97.10 | 92.10 |
| 1997 | 98.70 | 98.80 |
| 1998 | 97.60 | 99.50 |
| 1999 | 96.20 | 95.30 |
| 2000 | 27.90 | 28.70 |
| 2001 | 30.30 | 32.00 |
| 2002 | 27.10 | 31.80 |
| 2003 | 24.70 | 29.20 |
| 2004 | 15.30 | 15.70 |
| 2005 | 13.60 | 15.70 |
| 2006 | 7.80 | 8.80 |
| 2007 | 7.80 | 8.40 |
| 2008 | 7.40 | 8.20 |
| 2009 | 7.80 | 9.70 |
| 2010 | 9.00 | 16.50 |
| 2011 | 9.70 | 17.40 |
| 2012 | 10.50 | 10.80 |
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