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| year | production | consumption |
| 1980 | .66 | .64 |
| 1981 | .67 | .66 |
| 1982 | .76 | .71 |
| 1983 | .79 | .72 |
| 1984 | .93 | .80 |
| 1985 | 1.02 | .79 |
| 1986 | 1.39 | .90 |
| 1987 | 1.55 | .84 |
| 1988 | 1.62 | .91 |
| 1989 | 1.78 | .95 |
| 1990 | 1.96 | .93 |
| 1991 | 1.87 | .96 |
| 1992 | 1.90 | .98 |
| 1993 | 1.99 | 1.06 |
| 1994 | 2.01 | 1.10 |
| 1995 | 2.38 | 1.12 |
| 1996 | 2.61 | 1.19 |
| 1997 | 2.84 | 1.21 |
| 1998 | 3.05 | 1.24 |
| 1999 | 3.20 | 1.16 |
| 2000 | 3.08 | 1.16 |
| 2001 | 3.11 | 1.19 |
| 2002 | 2.91 | 1.16 |
| 2003 | 3.13 | 1.20 |
| 2004 | 3.24 | 1.23 |
| 2005 | 3.38 | 1.27 |
| 2006 | 3.61 | 1.31 |
| 2007 | 3.76 | 1.32 |
| 2008 | 4.04 | 1.36 |
| 2009 | 4.20 | 1.35 |
| 2010 | 4.53 | 1.45 |
| 2011 | 5.19 | 1.54 |
| 2012 | 5.33 | 1.58 |
| 2013 | 5.08 | 1.49 |
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