|
| year | production | consumption |
| 1980 | 118,531.90 | 76,770.59 |
| 1981 | 136,900.00 | 80,907.95 |
| 1982 | 142,528.00 | 82,049.65 |
| 1983 | 156,471.00 | 86,552.80 |
| 1984 | 167,577.50 | 93,347.73 |
| 1985 | 182,497.20 | 96,098.37 |
| 1986 | 195,173.30 | 93,853.55 |
| 1987 | 221,102.50 | 105,907.60 |
| 1988 | 201,061.10 | 100,783.20 |
| 1989 | 228,262.30 | 112,786.90 |
| 1990 | 239,968.00 | 113,512.80 |
| 1991 | 260,238.30 | 117,103.40 |
| 1992 | 279,752.30 | 120,921.50 |
| 1993 | 285,002.30 | 123,402.40 |
| 1994 | 287,453.90 | 126,377.80 |
| 1995 | 315,792.80 | 126,255.00 |
| 1996 | 331,661.80 | 138,634.70 |
| 1997 | 356,141.70 | 144,429.40 |
| 1998 | 388,844.60 | 158,123.50 |
| 1999 | 406,044.90 | 165,106.10 |
| 2000 | 426,524.70 | 166,146.60 |
| 2001 | 470,393.10 | 175,512.70 |
| 2002 | 492,218.30 | 176,813.20 |
| 2003 | 511,418.30 | 177,229.00 |
| 2004 | 552,331.20 | 192,120.30 |
| 2005 | 604,470.30 | 205,241.70 |
| 2006 | 688,857.40 | 216,097.00 |
| 2007 | 721,316.60 | 220,634.70 |
| 2008 | 717,330.70 | 215,589.40 |
| 2009 | 779,838.30 | 223,933.80 |
| 2010 | 831,606.30 | 221,519.90 |
| 2011 | 876,943.80 | 208,421.70 |
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