|
| year | production | consumption |
| 1980 | 125,845.40 | 122,928.70 |
| 1981 | 142,947.70 | 144,012.60 |
| 1982 | 149,364.30 | 150,294.60 |
| 1983 | 155,891.10 | 157,906.10 |
| 1984 | 183,867.70 | 186,706.20 |
| 1985 | 189,934.90 | 194,065.20 |
| 1986 | 208,396.40 | 208,829.60 |
| 1987 | 210,728.90 | 210,933.90 |
| 1988 | 226,404.80 | 221,892.00 |
| 1989 | 233,784.80 | 236,378.50 |
| 1990 | 247,569.20 | 247,863.50 |
| 1991 | 269,934.00 | 269,813.80 |
| 1992 | 279,483.30 | 281,854.40 |
| 1993 | 288,092.40 | 295,959.60 |
| 1994 | 300,807.50 | 312,526.20 |
| 1995 | 320,556.60 | 329,291.30 |
| 1996 | 314,853.20 | 318,616.50 |
| 1997 | 338,052.40 | 343,008.40 |
| 1998 | 343,076.80 | 354,649.90 |
| 1999 | 356,264.80 | 381,413.00 |
| 2000 | 370,018.40 | 396,193.80 |
| 2001 | 388,675.00 | 411,844.50 |
| 2002 | 395,625.10 | 419,532.00 |
| 2003 | 420,525.20 | 432,047.60 |
| 2004 | 446,683.00 | 481,400.30 |
| 2005 | 473,266.30 | 504,908.20 |
| 2006 | 500,192.50 | 539,485.50 |
| 2007 | 531,521.30 | 587,255.30 |
| 2008 | 568,447.60 | 640,524.50 |
| 2009 | 613,402.10 | 674,878.00 |
| 2010 | 611,718.90 | 662,585.00 |
| 2011 | 639,627.20 | 721,418.70 |
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