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| year | production | consumption |
| 1980 | 1.10 | .90 |
| 1981 | 1.10 | 1.00 |
| 1982 | 1.00 | 1.00 |
| 1983 | .90 | 1.10 |
| 1984 | 1.00 | 1.10 |
| 1985 | 1.00 | 1.10 |
| 1986 | .90 | .90 |
| 1987 | 1.20 | 1.20 |
| 1988 | 1.20 | 1.20 |
| 1989 | 1.30 | 1.30 |
| 1990 | 1.40 | 1.30 |
| 1991 | 1.40 | 1.10 |
| 1992 | 1.50 | 1.20 |
| 1993 | 1.60 | 1.20 |
| 1994 | 1.60 | 1.10 |
| 1995 | 1.70 | 1.20 |
| 1996 | 1.80 | 1.30 |
| 1997 | 1.80 | 1.40 |
| 1998 | 2.00 | 1.50 |
| 1999 | 2.10 | 1.60 |
| 2000 | 2.10 | 1.60 |
| 2001 | 2.30 | 1.60 |
| 2002 | 2.70 | 1.90 |
| 2003 | 2.60 | 1.80 |
| 2004 | 2.70 | 2.00 |
| 2005 | 3.00 | 2.20 |
| 2006 | 3.10 | 2.30 |
| 2007 | 2.90 | 2.30 |
| 2008 | 3.20 | 2.50 |
| 2009 | 3.60 | 2.80 |
| 2010 | 3.80 | 3.10 |
| 2011 | 3.90 | 3.20 |
| 2012 | 4.20 | 3.60 |
| 2013 | 4.20 | 3.60 |
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