|
| year | production | consumption |
| 1980 | 81.94 | 81.94 |
| 1981 | 81.66 | 81.66 |
| 1982 | 102.66 | 102.66 |
| 1983 | 127.67 | 127.67 |
| 1984 | 192.52 | 192.52 |
| 1985 | 216.64 | 216.64 |
| 1986 | 152.60 | 152.60 |
| 1987 | 144.38 | 144.44 |
| 1988 | 155.61 | 155.61 |
| 1989 | 163.55 | 163.55 |
| 1990 | 178.14 | 178.14 |
| 1991 | 202.98 | 202.98 |
| 1992 | 196.22 | 196.22 |
| 1993 | 220.32 | 220.32 |
| 1994 | 251.68 | 251.68 |
| 1995 | 270.41 | 270.41 |
| 1996 | 305.20 | 305.20 |
| 1997 | 355.94 | 355.94 |
| 1998 | 343.59 | 343.59 |
| 1999 | 432.93 | 355.59 |
| 2000 | 515.57 | 388.79 |
| 2001 | 548.06 | 430.81 |
| 2002 | 624.34 | 458.71 |
| 2003 | 887.79 | 503.92 |
| 2004 | 1,006.10 | 542.41 |
| 2005 | 1,084.49 | 622.22 |
| 2006 | 1,302.04 | 762.42 |
| 2007 | 1,399.82 | 780.26 |
| 2008 | 1,429.98 | 861.99 |
| 2009 | 1,478.99 | 828.37 |
| 2010 | 1,537.97 | 918.19 |
| 2011 | 1,470.16 | 906.54 |
|
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