|
| year | production | consumption |
| 1980 | 2,836.80 | 6,589.18 |
| 1981 | 2,696.03 | 6,058.97 |
| 1982 | 2,627.45 | 6,978.16 |
| 1983 | 2,464.84 | 9,599.87 |
| 1984 | 2,216.50 | 11,389.75 |
| 1985 | 2,047.94 | 12,104.36 |
| 1986 | 1,901.51 | 14,872.52 |
| 1987 | 1,652.63 | 16,211.19 |
| 1988 | 1,350.87 | 18,577.99 |
| 1989 | 864.66 | 19,680.51 |
| 1990 | 520.35 | 18,935.60 |
| 1991 | 443.76 | 20,659.09 |
| 1992 | 369.08 | 24,175.97 |
| 1993 | 361.53 | 26,702.30 |
| 1994 | 314.27 | 28,151.99 |
| 1995 | 259.29 | 29,029.96 |
| 1996 | 162.53 | 32,948.56 |
| 1997 | 109.23 | 37,424.26 |
| 1998 | 87.24 | 40,567.72 |
| 1999 | 101.05 | 43,695.52 |
| 2000 | 91.69 | 51,956.89 |
| 2001 | | 53,551.99 |
| 2002 | | 59,514.87 |
| 2003 | | 63,150.95 |
| 2004 | | 64,671.49 |
| 2005 | | 66,012.55 |
| 2006 | | 69,084.29 |
| 2007 | | 72,281.30 |
| 2008 | | 69,396.03 |
| 2009 | | 66,198.84 |
| 2010 | | 70,002.72 |
| 2011 | | 73,330.63 |
|
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