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Loading...
| year | production | consumption |
| 1980 | 4.50 | 3.30 |
| 1981 | 5.20 | 3.70 |
| 1982 | 5.60 | 3.70 |
| 1983 | 6.70 | 4.40 |
| 1984 | 8.60 | 5.80 |
| 1985 | 11.00 | 7.90 |
| 1986 | 12.00 | 9.80 |
| 1987 | 15.00 | 13.00 |
| 1988 | 15.00 | 13.00 |
| 1989 | 15.00 | 14.00 |
| 1990 | 16.00 | 13.00 |
| 1991 | 16.00 | 13.00 |
| 1992 | 16.00 | 13.00 |
| 1993 | 16.00 | 13.00 |
| 1994 | 17.00 | 14.00 |
| 1995 | 17.00 | 14.00 |
| 1996 | 17.00 | 14.00 |
| 1997 | 18.00 | 14.00 |
| 1998 | 13.00 | 10.00 |
| 1999 | 14.00 | 11.00 |
| 2000 | 15.00 | 11.00 |
| 2001 | 15.00 | 11.00 |
| 2002 | 16.00 | 12.00 |
| 2003 | 18.00 | 12.00 |
| 2004 | 19.00 | 13.00 |
| 2005 | 21.00 | 19.00 |
| 2006 | 23.00 | 21.00 |
| 2007 | 25.00 | 21.00 |
| 2008 | 29.00 | 25.00 |
| 2009 | 29.00 | 23.00 |
| 2010 | 31.00 | 25.00 |
| 2011 | 26.00 | 21.00 |
| 2012 | 32.00 | 26.00 |
| 2013 | 28.00 | 23.00 |
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