|
| year | production | consumption |
| 1980 | 250.00 | 232.00 |
| 1981 | 210.00 | 155.00 |
| 1982 | 250.00 | 200.00 |
| 1983 | 310.00 | 310.00 |
| 1984 | 476.00 | 476.00 |
| 1985 | 600.00 | 600.00 |
| 1986 | 536.00 | 536.00 |
| 1987 | 565.00 | 565.00 |
| 1988 | 706.30 | 706.30 |
| 1989 | 783.99 | 783.99 |
| 1990 | 837.00 | 837.00 |
| 1991 | 918.00 | 811.00 |
| 1992 | 882.88 | 882.88 |
| 1993 | 955.98 | 938.32 |
| 1994 | 1,123.02 | 1,123.02 |
| 1995 | 1,246.61 | 1,243.08 |
| 1996 | 1,420.02 | 1,416.49 |
| 1997 | 1,659.81 | 1,663.34 |
| 1998 | 1,765.75 | 1,827.55 |
| 1999 | 2,041.21 | 2,111.84 |
| 2000 | 2,127.38 | 2,220.96 |
| 2001 | 2,330.79 | 2,478.41 |
| 2002 | 2,648.63 | 2,798.01 |
| 2003 | 2,860.52 | 2,909.96 |
| 2004 | 2,962.93 | 3,020.85 |
| 2005 | 3,655.10 | 3,707.37 |
| 2006 | 3,835.56 | 3,839.09 |
| 2007 | 3,951.75 | 3,992.01 |
| 2008 | 4,107.13 | 4,212.73 |
| 2009 | 4,986.37 | 4,993.54 |
| 2010 | 5,161.29 | 5,105.84 |
| 2011 | 5,360.82 | 5,415.20 |
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