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| year | production | consumption |
| 1986 | 9.80 | 9.80 |
| 1987 | 7.80 | 9.40 |
| 1988 | 9.40 | 9.70 |
| 1989 | 9.80 | 10.00 |
| 1990 | 11.00 | 12.00 |
| 1991 | 12.00 | 12.00 |
| 1992 | 9.50 | 12.00 |
| 1993 | 8.70 | 13.00 |
| 1994 | 13.00 | 14.00 |
| 1995 | 13.00 | 14.00 |
| 1996 | 13.00 | 15.00 |
| 1997 | 11.00 | 15.00 |
| 1998 | 14.00 | 16.00 |
| 1999 | 13.00 | 17.00 |
| 2000 | 14.00 | 17.00 |
| 2001 | 15.00 | 19.00 |
| 2002 | 15.00 | 18.00 |
| 2003 | 16.00 | 20.00 |
| 2004 | 14.00 | 21.00 |
| 2005 | 15.00 | 22.00 |
| 2006 | 14.00 | 20.00 |
| 2007 | 13.00 | 22.00 |
| 2008 | 18.00 | 37.00 |
| 2009 | 50.00 | 34.00 |
| 2010 | 44.00 | 43.00 |
| 2011 | 64.00 | 45.00 |
| 2012 | 64.00 | 56.00 |
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