|
| year | production | consumption |
| 1980 | 829,700.00 | 702,729.80 |
| 1981 | 823,775.00 | 732,626.80 |
| 1982 | 838,112.00 | 706,910.60 |
| 1983 | 782,091.00 | 736,672.30 |
| 1984 | 895,920.80 | 791,295.70 |
| 1985 | 883,638.40 | 818,048.70 |
| 1986 | 890,314.90 | 804,230.90 |
| 1987 | 918,761.40 | 836,940.60 |
| 1988 | 950,264.50 | 883,641.80 |
| 1989 | 980,729.00 | 894,999.90 |
| 1990 | 1,029,076.00 | 904,497.60 |
| 1991 | 995,984.10 | 899,226.80 |
| 1992 | 997,544.90 | 907,654.80 |
| 1993 | 945,424.30 | 944,081.30 |
| 1994 | 1,033,504.00 | 951,285.90 |
| 1995 | 1,032,974.00 | 962,103.80 |
| 1996 | 1,063,856.00 | 1,006,321.00 |
| 1997 | 1,089,932.00 | 1,029,544.00 |
| 1998 | 1,117,535.00 | 1,037,103.00 |
| 1999 | 1,100,432.00 | 1,038,647.00 |
| 2000 | 1,073,612.00 | 1,084,095.00 |
| 2001 | 1,127,689.00 | 1,060,146.00 |
| 2002 | 1,094,283.00 | 1,066,355.00 |
| 2003 | 1,071,753.00 | 1,094,861.00 |
| 2004 | 1,112,099.00 | 1,107,255.00 |
| 2005 | 1,131,498.00 | 1,125,978.00 |
| 2006 | 1,162,750.00 | 1,112,292.00 |
| 2007 | 1,146,635.00 | 1,127,998.00 |
| 2008 | 1,171,809.00 | 1,120,549.00 |
| 2009 | 1,074,923.00 | 997,477.60 |
| 2010 | 1,084,368.00 | 1,051,307.00 |
| 2011 | 1,094,336.00 | 1,003,066.00 |
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