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| year | production | consumption |
| 1980 | 2.29 | 2.74 |
| 1981 | 2.36 | 2.72 |
| 1982 | 2.48 | 2.86 |
| 1983 | 2.58 | 2.93 |
| 1984 | 2.52 | 2.85 |
| 1985 | 2.41 | 2.88 |
| 1986 | 2.49 | 2.96 |
| 1987 | 2.49 | 3.05 |
| 1988 | 2.48 | 3.01 |
| 1989 | 2.29 | 3.11 |
| 1990 | 1.87 | 2.81 |
| 1991 | 1.62 | 2.20 |
| 1992 | 1.51 | 2.05 |
| 1993 | 1.46 | 1.96 |
| 1994 | 1.42 | 1.88 |
| 1995 | 1.45 | 2.02 |
| 1996 | 1.43 | 2.05 |
| 1997 | 1.40 | 2.03 |
| 1998 | 1.25 | 1.74 |
| 1999 | 1.21 | 1.59 |
| 2000 | 1.19 | 1.59 |
| 2001 | 1.25 | 1.71 |
| 2002 | 1.20 | 1.68 |
| 2003 | 1.14 | 1.62 |
| 2004 | 1.14 | 1.68 |
| 2005 | 1.15 | 1.66 |
| 2006 | 1.18 | 1.67 |
| 2007 | 1.16 | 1.65 |
| 2008 | 1.19 | 1.66 |
| 2009 | 1.13 | 1.40 |
| 2010 | 1.14 | 1.41 |
| 2011 | 1.13 | 1.42 |
| 2012 | 1.09 | 1.42 |
| 2013 | 1.04 | 1.38 |
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