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Loading...
| year | production | consumption |
| 1980 | 3.70 | 3.00 |
| 1981 | 4.40 | 3.50 |
| 1982 | 5.70 | 4.70 |
| 1983 | 7.40 | 6.30 |
| 1984 | 8.40 | 7.20 |
| 1985 | 8.90 | 7.70 |
| 1986 | 8.80 | 7.60 |
| 1987 | 8.40 | 7.20 |
| 1988 | 7.60 | 5.40 |
| 1989 | 8.00 | 5.80 |
| 1990 | 8.30 | 5.30 |
| 1991 | 8.20 | 5.10 |
| 1992 | 7.50 | 4.30 |
| 1993 | 8.10 | 4.90 |
| 1994 | 10.00 | 5.80 |
| 1995 | 15.00 | 9.80 |
| 1996 | 16.00 | 11.00 |
| 1997 | 17.00 | 12.00 |
| 1998 | 20.00 | 14.00 |
| 1999 | 22.00 | 14.00 |
| 2000 | 24.00 | 16.00 |
| 2001 | 25.00 | 18.00 |
| 2002 | 26.00 | 20.00 |
| 2003 | 28.00 | 21.00 |
| 2004 | 30.00 | 23.00 |
| 2005 | 33.00 | 26.00 |
| 2006 | 35.00 | 27.00 |
| 2007 | 36.00 | 28.00 |
| 2008 | 39.00 | 30.00 |
| 2009 | 41.00 | 30.00 |
| 2010 | 44.00 | 36.00 |
| 2011 | 40.00 | 33.00 |
| 2012 | 31.00 | 27.00 |
| 2013 | 25.00 | 20.00 |
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