|
| year | production | consumption |
| 1980 | 182.00 | 643.00 |
| 1981 | 325.00 | 729.00 |
| 1982 | 390.00 | 737.00 |
| 1983 | 480.00 | 773.00 |
| 1984 | 519.00 | 824.00 |
| 1985 | 620.00 | 894.90 |
| 1986 | 630.00 | 947.44 |
| 1987 | 609.00 | 987.85 |
| 1988 | 635.00 | 1,083.78 |
| 1989 | 700.00 | 1,149.78 |
| 1990 | 660.00 | 1,168.33 |
| 1991 | 615.00 | 1,190.32 |
| 1992 | 561.15 | 1,274.91 |
| 1993 | 534.00 | 1,311.07 |
| 1994 | 589.90 | 1,413.27 |
| 1995 | 703.45 | 1,574.67 |
| 1996 | 651.02 | 1,680.92 |
| 1997 | 674.62 | 1,765.49 |
| 1998 | 661.42 | 1,844.37 |
| 1999 | 652.66 | 2,031.25 |
| 2000 | 646.34 | 2,127.44 |
| 2001 | 642.40 | 2,183.73 |
| 2002 | 664.75 | 2,263.44 |
| 2003 | 660.03 | 2,346.33 |
| 2004 | 683.11 | 2,429.62 |
| 2005 | 664.66 | 2,512.43 |
| 2006 | 688.61 | 2,690.90 |
| 2007 | 697.53 | 2,800.75 |
| 2008 | 693.71 | 2,864.00 |
| 2009 | 680.43 | 3,112.74 |
| 2010 | 751.30 | 3,255.39 |
| 2011 | 782.34 | 3,426.00 |
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