|
| year | production | consumption |
| 1980 | 505.00 | 505.00 |
| 1981 | 450.00 | 450.00 |
| 1982 | 381.00 | 381.00 |
| 1983 | 431.00 | 431.00 |
| 1984 | 438.00 | 438.00 |
| 1985 | 457.00 | 457.00 |
| 1986 | 484.00 | 484.00 |
| 1987 | 494.30 | 494.30 |
| 1988 | 490.88 | 503.29 |
| 1989 | 505.00 | 505.00 |
| 1990 | 508.00 | 494.37 |
| 1991 | 526.00 | 511.30 |
| 1992 | 533.26 | 516.77 |
| 1993 | 558.33 | 540.95 |
| 1994 | 588.70 | 569.94 |
| 1995 | 601.41 | 581.52 |
| 1996 | 711.84 | 646.02 |
| 1997 | 801.30 | 697.33 |
| 1998 | 821.60 | 724.72 |
| 1999 | 889.34 | 782.37 |
| 2000 | 962.33 | 902.37 |
| 2001 | 1,070.40 | 974.23 |
| 2002 | 1,152.68 | 1,061.29 |
| 2003 | 1,211.30 | 1,143.43 |
| 2004 | 1,439.44 | 1,350.30 |
| 2005 | 1,762.93 | 1,654.51 |
| 2006 | 2,066.56 | 1,993.46 |
| 2007 | 2,446.27 | 2,490.06 |
| 2008 | 2,685.35 | 2,725.58 |
| 2009 | 2,975.01 | 3,125.27 |
| 2010 | 3,334.09 | 3,768.46 |
| 2011 | 3,628.65 | 4,623.55 |
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