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| year | production | consumption |
| 1980 | 5.45 | .52 |
| 1981 | 2.16 | .48 |
| 1982 | 2.19 | .46 |
| 1983 | 2.17 | .55 |
| 1984 | 2.61 | .54 |
| 1985 | 3.09 | .57 |
| 1986 | 3.66 | .62 |
| 1987 | 4.58 | .64 |
| 1988 | 5.97 | .77 |
| 1989 | 6.47 | .83 |
| 1990 | 4.54 | .92 |
| 1991 | .72 | .62 |
| 1992 | 1.02 | .84 |
| 1993 | 1.21 | .96 |
| 1994 | 1.33 | 1.10 |
| 1995 | 1.35 | 1.13 |
| 1996 | 1.39 | 1.13 |
| 1997 | 2.60 | 1.04 |
| 1998 | 4.71 | 1.06 |
| 1999 | 5.48 | 1.07 |
| 2000 | 5.62 | 1.08 |
| 2001 | 5.22 | 1.13 |
| 2002 | 4.42 | 1.14 |
| 2003 | 2.84 | 1.01 |
| 2004 | 4.38 | 1.13 |
| 2005 | 4.12 | 1.24 |
| 2006 | 4.39 | 1.23 |
| 2007 | 4.56 | 1.30 |
| 2008 | 5.18 | 1.34 |
| 2009 | 5.17 | 1.38 |
| 2010 | 5.21 | 1.44 |
| 2011 | 5.67 | 1.47 |
| 2012 | 6.45 | 1.62 |
| 2013 | 6.61 | 1.71 |
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