|
| year | production | consumption |
| 1980 | | |
| 1981 | | |
| 1982 | | |
| 1983 | | |
| 1984 | | |
| 1985 | | |
| 1986 | | |
| 1987 | | |
| 1988 | | |
| 1989 | | |
| 1990 | | |
| 1991 | | |
| 1992 | 22,615.73 | 16,481.51 |
| 1993 | 21,814.08 | 16,184.86 |
| 1994 | 21,450.33 | 15,213.70 |
| 1995 | 21,005.36 | 14,507.40 |
| 1996 | 19,864.69 | 13,085.62 |
| 1997 | 18,900.59 | 12,298.45 |
| 1998 | 19,553.92 | 12,603.57 |
| 1999 | 19,592.76 | 12,582.38 |
| 2000 | 19,334.96 | 13,058.78 |
| 2001 | 19,221.96 | 12,905.51 |
| 2002 | 19,684.58 | 13,564.14 |
| 2003 | 20,507.42 | 14,204.40 |
| 2004 | 20,991.24 | 14,567.08 |
| 2005 | 21,224.31 | 14,330.47 |
| 2006 | 21,736.38 | 15,223.94 |
| 2007 | 21,595.12 | 15,226.77 |
| 2008 | 21,515.00 | 15,545.66 |
| 2009 | 19,303.00 | 13,504.81 |
| 2010 | 21,536.00 | 14,960.85 |
| 2011 | 23,685.77 | 17,975.34 |
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