|
| year | production | consumption |
| 1980 | | 5.51 |
| 1981 | | 399.04 |
| 1982 | | 1,000.90 |
| 1983 | | 1,857.40 |
| 1984 | | 2,958.60 |
| 1985 | | 3,233.08 |
| 1986 | | 3,547.24 |
| 1987 | | 3,600.15 |
| 1988 | | 3,589.13 |
| 1989 | | 3,826.12 |
| 1990 | | 4,101.70 |
| 1991 | | 4,476.49 |
| 1992 | | 5,517.07 |
| 1993 | | 6,235.78 |
| 1994 | | 6,613.87 |
| 1995 | | 7,241.08 |
| 1996 | | 8,641.02 |
| 1997 | | 9,525.07 |
| 1998 | | 10,249.29 |
| 1999 | | 10,003.59 |
| 2000 | | 11,674.25 |
| 2001 | | 12,661.70 |
| 2002 | | 13,743.51 |
| 2003 | | 13,961.10 |
| 2004 | | 14,028.68 |
| 2005 | | 13,364.42 |
| 2006 | | 14,320.57 |
| 2007 | | 14,654.13 |
| 2008 | | 14,263.91 |
| 2009 | | 13,059.08 |
| 2010 | | 13,569.45 |
| 2011 | | 13,908.96 |
|
|
