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| year | production | consumption |
| 1980 | .80 | .70 |
| 1981 | .80 | .80 |
| 1982 | .70 | .80 |
| 1983 | .80 | .90 |
| 1984 | .90 | 1.00 |
| 1985 | 4.10 | 1.40 |
| 1986 | 12.00 | 1.80 |
| 1987 | 19.00 | 2.70 |
| 1988 | 20.00 | 2.80 |
| 1989 | 24.00 | 2.80 |
| 1990 | 27.00 | 2.30 |
| 1991 | 29.00 | 2.60 |
| 1992 | 27.00 | 2.50 |
| 1993 | 31.00 | 2.60 |
| 1994 | 36.00 | 2.80 |
| 1995 | 42.00 | 3.30 |
| 1996 | 45.00 | 4.00 |
| 1997 | 50.00 | 3.50 |
| 1998 | 50.00 | 3.80 |
| 1999 | 51.00 | 3.90 |
| 2000 | 53.00 | 4.20 |
| 2001 | 45.00 | 4.30 |
| 2002 | 48.00 | 4.40 |
| 2003 | 51.00 | 4.20 |
| 2004 | 51.00 | 4.20 |
| 2005 | 51.00 | 4.50 |
| 2006 | 53.00 | 4.90 |
| 2007 | 53.00 | 5.40 |
| 2008 | 55.00 | 5.70 |
| 2009 | 54.00 | 6.20 |
| 2010 | 54.00 | 6.80 |
| 2011 | 57.00 | 7.50 |
| 2012 | 60.00 | 8.10 |
| 2013 | 60.00 | 8.90 |
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