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| year | production | consumption |
| 1980 | 2.80 | .79 |
| 1981 | 3.04 | .67 |
| 1982 | 3.23 | .98 |
| 1983 | 3.61 | 1.07 |
| 1984 | 3.86 | 1.15 |
| 1985 | 3.91 | 1.05 |
| 1986 | 3.97 | 1.07 |
| 1987 | 4.22 | 1.15 |
| 1988 | 4.30 | 1.22 |
| 1989 | 4.50 | 1.18 |
| 1990 | 4.75 | 1.25 |
| 1991 | 4.92 | 1.36 |
| 1992 | 5.03 | 1.30 |
| 1993 | 4.88 | 1.20 |
| 1994 | 4.74 | 1.24 |
| 1995 | 5.05 | 1.29 |
| 1996 | 5.25 | 1.26 |
| 1997 | 5.59 | 1.20 |
| 1998 | 5.75 | 1.25 |
| 1999 | 6.02 | 1.25 |
| 2000 | 6.19 | 1.24 |
| 2001 | 6.17 | 1.25 |
| 2002 | 6.39 | 1.28 |
| 2003 | 6.79 | 1.29 |
| 2004 | 6.90 | 1.25 |
| 2005 | 7.48 | 1.48 |
| 2006 | 7.42 | 1.54 |
| 2007 | 7.32 | 1.61 |
| 2008 | 7.38 | 1.74 |
| 2009 | 7.06 | 1.84 |
| 2010 | 7.12 | 1.86 |
| 2011 | 7.02 | 2.00 |
| 2012 | 7.00 | 2.11 |
| 2013 | 6.51 | 2.13 |
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