|
| year | production | consumption |
| 1980 | 115,196.00 | 73,439.29 |
| 1981 | 133,349.90 | 77,464.93 |
| 1982 | 139,098.50 | 78,820.77 |
| 1983 | 152,683.30 | 83,008.45 |
| 1984 | 162,789.30 | 89,322.49 |
| 1985 | 177,170.10 | 91,623.02 |
| 1986 | 189,058.50 | 87,284.32 |
| 1987 | 214,906.60 | 99,286.29 |
| 1988 | 193,591.20 | 92,988.78 |
| 1989 | 215,457.80 | 103,668.00 |
| 1990 | 225,491.00 | 103,720.90 |
| 1991 | 242,075.30 | 108,077.20 |
| 1992 | 251,700.70 | 111,208.90 |
| 1993 | 249,194.00 | 109,060.50 |
| 1994 | 248,463.20 | 109,750.50 |
| 1995 | 266,546.60 | 112,244.00 |
| 1996 | 272,435.20 | 120,434.10 |
| 1997 | 291,515.10 | 126,833.00 |
| 1998 | 316,750.30 | 137,690.80 |
| 1999 | 320,774.80 | 140,661.50 |
| 2000 | 338,103.20 | 140,919.50 |
| 2001 | 362,855.50 | 140,991.10 |
| 2002 | 374,673.40 | 143,245.40 |
| 2003 | 376,619.00 | 142,749.30 |
| 2004 | 388,230.80 | 144,656.30 |
| 2005 | 410,674.90 | 154,785.50 |
| 2006 | 425,312.50 | 156,856.70 |
| 2007 | 441,696.20 | 156,529.30 |
| 2008 | 437,701.40 | 155,547.20 |
| 2009 | 453,763.20 | 156,551.40 |
| 2010 | 467,479.20 | 154,549.60 |
| 2011 | 456,690.90 | 131,174.00 |
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