|
| year | production | consumption |
| 1980 | 38,760.57 | 44,974.30 |
| 1981 | 40,704.98 | 48,465.26 |
| 1982 | 41,730.75 | 48,614.69 |
| 1983 | 49,078.10 | 57,344.33 |
| 1984 | 48,797.01 | 57,805.10 |
| 1985 | 51,346.77 | 60,348.24 |
| 1986 | 52,379.63 | 62,070.05 |
| 1987 | 56,814.23 | 67,078.95 |
| 1988 | 64,805.99 | 76,168.61 |
| 1989 | 66,395.52 | 77,723.98 |
| 1990 | 42,089.55 | 51,971.78 |
| 1991 | 35,721.50 | 43,321.94 |
| 1992 | 42,295.69 | 48,619.65 |
| 1993 | 43,817.98 | 48,853.34 |
| 1994 | 44,695.42 | 49,507.01 |
| 1995 | 45,328.14 | 50,193.75 |
| 1996 | 46,152.68 | 50,123.20 |
| 1997 | 37,265.84 | 42,065.30 |
| 1998 | 28,914.73 | 34,568.48 |
| 1999 | 25,223.09 | 30,790.86 |
| 2000 | 32,281.19 | 35,648.75 |
| 2001 | 36,694.84 | 38,170.84 |
| 2002 | 33,525.70 | 38,363.74 |
| 2003 | 36,445.72 | 41,821.69 |
| 2004 | 35,044.68 | 40,411.84 |
| 2005 | 34,288.50 | 40,325.86 |
| 2006 | 38,496.02 | 45,193.66 |
| 2007 | 39,440.70 | 44,505.82 |
| 2008 | 39,529.99 | 44,472.75 |
| 2009 | 37,435.60 | 38,683.41 |
| 2010 | 34,311.64 | 35,946.38 |
| 2011 | 38,870.80 | 41,750.04 |
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