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| year | production | consumption |
| 1980 | .90 | .80 |
| 1981 | 1.00 | .80 |
| 1982 | 1.00 | .80 |
| 1983 | 1.10 | .80 |
| 1984 | 1.00 | .80 |
| 1985 | 1.00 | 1.00 |
| 1986 | 1.40 | 1.30 |
| 1987 | 1.30 | 1.30 |
| 1988 | 1.90 | 1.80 |
| 1989 | 2.00 | 1.80 |
| 1990 | 2.30 | 2.00 |
| 1991 | 2.30 | 1.90 |
| 1992 | 2.40 | 1.70 |
| 1993 | 2.50 | 1.70 |
| 1994 | 2.10 | 1.40 |
| 1995 | 2.30 | 1.60 |
| 1996 | 3.00 | 2.20 |
| 1997 | 3.10 | 2.40 |
| 1998 | 3.30 | 2.60 |
| 1999 | 3.10 | 2.50 |
| 2000 | 3.50 | 3.10 |
| 2001 | 3.70 | 3.20 |
| 2002 | 3.90 | 3.40 |
| 2003 | 4.40 | 3.70 |
| 2004 | 4.70 | 3.90 |
| 2005 | 5.40 | 4.10 |
| 2006 | 5.70 | 4.20 |
| 2007 | 6.10 | 4.70 |
| 2008 | 6.30 | 4.90 |
| 2009 | 6.40 | 4.80 |
| 2010 | 6.50 | 4.90 |
| 2011 | 7.30 | 5.20 |
| 2012 | 7.50 | 5.20 |
| 2013 | 7.80 | 5.40 |
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