|
| year | production | consumption |
| 1980 | 2,874.64 | 3,271.05 |
| 1981 | 2,998.38 | 3,338.22 |
| 1982 | 2,895.45 | 3,267.00 |
| 1983 | 3,223.39 | 3,647.32 |
| 1984 | 3,928.45 | 4,605.43 |
| 1985 | 4,552.99 | 5,276.01 |
| 1986 | 4,986.15 | 5,688.32 |
| 1987 | 5,553.37 | 6,378.05 |
| 1988 | 6,023.13 | 7,060.52 |
| 1989 | 6,510.67 | 7,559.13 |
| 1990 | 6,881.28 | 8,040.16 |
| 1991 | 7,080.55 | 8,372.75 |
| 1992 | 11,641.40 | 11,689.92 |
| 1993 | 12,472.32 | 12,378.10 |
| 1994 | 11,927.26 | 12,717.00 |
| 1995 | 12,427.56 | 13,124.81 |
| 1996 | 13,616.70 | 14,541.88 |
| 1997 | 14,302.47 | 15,509.11 |
| 1998 | 14,553.06 | 15,955.39 |
| 1999 | 15,523.06 | 16,772.70 |
| 2000 | 17,689.78 | 17,995.36 |
| 2001 | 18,772.64 | 18,766.60 |
| 2002 | 20,054.05 | 20,408.15 |
| 2003 | 20,993.60 | 21,252.64 |
| 2004 | 22,387.41 | 22,914.38 |
| 2005 | 24,673.78 | 25,076.19 |
| 2006 | 26,206.84 | 26,860.29 |
| 2007 | 27,990.72 | 28,559.41 |
| 2008 | 29,818.15 | 30,185.43 |
| 2009 | 30,230.78 | 31,376.76 |
| 2010 | 32,748.04 | 34,213.96 |
| 2011 | 35,728.75 | 37,106.50 |
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