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| year | production | consumption |
| 1980 | 6.70 | 5.90 |
| 1981 | 7.70 | 6.70 |
| 1982 | 8.80 | 7.70 |
| 1983 | 9.60 | 8.20 |
| 1984 | 11.00 | 9.00 |
| 1985 | 12.00 | 9.70 |
| 1986 | 12.00 | 10.00 |
| 1987 | 13.00 | 11.00 |
| 1988 | 14.00 | 12.00 |
| 1989 | 14.00 | 12.00 |
| 1990 | 15.00 | 13.00 |
| 1991 | 16.00 | 13.00 |
| 1992 | 17.00 | 14.00 |
| 1993 | 18.00 | 14.00 |
| 1994 | 19.00 | 14.00 |
| 1995 | 18.00 | 14.00 |
| 1996 | 19.00 | 15.00 |
| 1997 | 20.00 | 15.00 |
| 1998 | 21.00 | 17.00 |
| 1999 | 23.00 | 18.00 |
| 2000 | 24.00 | 20.00 |
| 2001 | 25.00 | 21.00 |
| 2002 | 26.00 | 22.00 |
| 2003 | 28.00 | 24.00 |
| 2004 | 29.00 | 24.00 |
| 2005 | 32.00 | 28.00 |
| 2006 | 33.00 | 27.00 |
| 2007 | 35.00 | 28.00 |
| 2008 | 38.00 | 30.00 |
| 2009 | 36.00 | 28.00 |
| 2010 | 43.00 | 34.00 |
| 2011 | 48.00 | 38.00 |
| 2012 | 54.00 | 43.00 |
| 2013 | 56.00 | 45.00 |
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