|
| year | production | consumption |
| 1980 | 48,618.54 | 49,335.05 |
| 1981 | 50,212.49 | 50,900.33 |
| 1982 | 52,829.38 | 53,600.99 |
| 1983 | 53,423.52 | 55,903.72 |
| 1984 | 54,797.00 | 57,387.43 |
| 1985 | 57,320.19 | 60,075.97 |
| 1986 | 56,912.34 | 59,447.65 |
| 1987 | 55,843.09 | 56,835.17 |
| 1988 | 68,662.98 | 71,308.52 |
| 1989 | 54,633.86 | 57,279.41 |
| 1990 | 51,029.30 | 53,674.85 |
| 1991 | 49,338.36 | 51,901.23 |
| 1992 | 43,066.20 | 45,656.63 |
| 1993 | 39,506.84 | 41,938.54 |
| 1994 | 37,037.66 | 38,684.52 |
| 1995 | 34,502.34 | 35,510.96 |
| 1996 | 30,600.16 | 30,645.36 |
| 1997 | 30,017.04 | 30,078.77 |
| 1998 | 27,102.53 | 27,136.70 |
| 1999 | 30,600.16 | 30,541.74 |
| 2000 | 32,786.05 | 32,708.88 |
| 2001 | 33,660.18 | 33,756.08 |
| 2002 | 32,360.55 | 32,151.12 |
| 2003 | 33,316.26 | 32,896.28 |
| 2004 | 34,955.39 | 33,645.85 |
| 2005 | 38,151.00 | 35,505.45 |
| 2006 | 38,697.74 | 36,421.47 |
| 2007 | 33,441.92 | 29,712.80 |
| 2008 | 35,641.03 | 33,164.14 |
| 2009 | 34,784.54 | 31,899.79 |
| 2010 | 35,226.56 | 30,805.19 |
| 2011 | 34,784.54 | 31,321.07 |
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