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| year | production | consumption |
| 1980 | 3.90 | 3.30 |
| 1981 | 4.20 | 3.50 |
| 1982 | 4.40 | 3.70 |
| 1983 | 4.70 | 4.00 |
| 1984 | 4.90 | 4.00 |
| 1985 | 5.20 | 4.20 |
| 1986 | 5.30 | 4.20 |
| 1987 | 5.60 | 4.50 |
| 1988 | 6.30 | 5.00 |
| 1989 | 7.50 | 5.80 |
| 1990 | 8.50 | 6.30 |
| 1991 | 9.10 | 6.70 |
| 1992 | 9.40 | 6.90 |
| 1993 | 10.00 | 7.90 |
| 1994 | 12.00 | 9.20 |
| 1995 | 14.00 | 11.00 |
| 1996 | 17.00 | 13.00 |
| 1997 | 19.00 | 15.00 |
| 1998 | 21.00 | 17.00 |
| 1999 | 23.00 | 19.00 |
| 2000 | 26.00 | 22.00 |
| 2001 | 30.00 | 25.00 |
| 2002 | 35.00 | 30.00 |
| 2003 | 39.00 | 34.00 |
| 2004 | 44.00 | 39.00 |
| 2005 | 51.00 | 45.00 |
| 2006 | 58.00 | 52.00 |
| 2007 | 64.00 | 59.00 |
| 2008 | 70.00 | 66.00 |
| 2009 | 80.00 | 75.00 |
| 2010 | 91.00 | 86.00 |
| 2011 | 101.00 | 95.00 |
| 2012 | 115.00 | 106.00 |
| 2013 | 122.00 | 112.00 |
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