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| year | production | consumption |
| 1980 | 1.76 | 1.76 |
| 1981 | 1.85 | 1.85 |
| 1982 | 1.96 | 1.96 |
| 1983 | 2.12 | 2.12 |
| 1984 | 2.27 | 2.27 |
| 1985 | 2.10 | 2.10 |
| 1986 | 2.12 | 2.12 |
| 1987 | 2.15 | 2.15 |
| 1988 | 2.23 | 2.23 |
| 1989 | 2.36 | 2.36 |
| 1990 | 2.49 | 2.49 |
| 1991 | 2.45 | 2.45 |
| 1992 | 2.51 | 2.51 |
| 1993 | 2.10 | 2.10 |
| 1994 | 2.43 | 2.43 |
| 1995 | 2.47 | 2.47 |
| 1996 | 2.65 | 2.65 |
| 1997 | 2.85 | 2.85 |
| 1998 | 2.81 | 2.81 |
| 1999 | 3.28 | 3.28 |
| 2000 | 3.77 | 3.77 |
| 2001 | 4.05 | 4.05 |
| 2002 | 4.33 | 4.33 |
| 2003 | 4.55 | 4.55 |
| 2004 | 4.48 | 4.48 |
| 2005 | 4.43 | 4.43 |
| 2006 | 4.66 | 4.66 |
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