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| year | production | consumption |
| 1980 | .90 | .80 |
| 1981 | 1.10 | 1.00 |
| 1982 | 1.50 | 1.30 |
| 1983 | 1.80 | 1.60 |
| 1984 | 2.30 | 2.00 |
| 1985 | 2.70 | 2.40 |
| 1986 | 3.40 | 3.00 |
| 1987 | 3.70 | 3.20 |
| 1988 | 4.10 | 3.70 |
| 1989 | 4.40 | 4.00 |
| 1990 | 4.20 | 3.70 |
| 1991 | 4.30 | 3.80 |
| 1992 | 4.80 | 4.20 |
| 1993 | 5.50 | 4.80 |
| 1994 | 5.80 | 5.00 |
| 1995 | 6.10 | 5.20 |
| 1996 | 6.40 | 5.50 |
| 1997 | 6.90 | 5.80 |
| 1998 | 7.70 | 6.40 |
| 1999 | 7.90 | 6.40 |
| 2000 | 8.60 | 6.70 |
| 2001 | 9.20 | 7.30 |
| 2002 | 9.70 | 7.60 |
| 2003 | 10.00 | 7.80 |
| 2004 | 11.00 | 8.70 |
| 2005 | 12.00 | 9.10 |
| 2006 | 13.00 | 10.00 |
| 2007 | 13.00 | 10.00 |
| 2008 | 15.00 | 12.00 |
| 2009 | 17.00 | 13.00 |
| 2010 | 18.00 | 15.00 |
| 2011 | 20.00 | 17.00 |
| 2012 | 24.00 | 20.00 |
| 2013 | 26.00 | 23.00 |
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