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| year | production | consumption |
| 1980 | 1.00 | .80 |
| 1981 | 1.20 | 1.00 |
| 1982 | 1.50 | 1.30 |
| 1983 | 1.80 | 1.50 |
| 1984 | 2.10 | 1.80 |
| 1985 | 2.30 | 2.00 |
| 1986 | 2.80 | 2.20 |
| 1987 | 2.50 | 2.00 |
| 1988 | 2.50 | 2.00 |
| 1989 | 3.20 | 2.70 |
| 1990 | 3.40 | 3.10 |
| 1991 | 3.50 | 3.30 |
| 1992 | 4.20 | 3.90 |
| 1993 | 4.50 | 4.20 |
| 1994 | 4.80 | 4.50 |
| 1995 | 5.30 | 5.40 |
| 1996 | 5.70 | 5.40 |
| 1997 | 5.90 | 5.70 |
| 1998 | 6.30 | 6.00 |
| 1999 | 6.70 | 6.50 |
| 2000 | 6.90 | 6.50 |
| 2001 | 7.10 | 6.50 |
| 2002 | 7.60 | 7.00 |
| 2003 | 7.50 | 7.40 |
| 2004 | 8.40 | 8.10 |
| 2005 | 9.10 | 8.50 |
| 2006 | 10.00 | 9.40 |
| 2007 | 12.00 | 10.00 |
| 2008 | 13.00 | 11.00 |
| 2009 | 13.00 | 12.00 |
| 2010 | 14.00 | 13.00 |
| 2011 | 14.00 | 13.00 |
| 2012 | 16.00 | 14.00 |
| 2013 | 16.00 | 14.00 |
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