|
| year | production | consumption |
| 1980 | 40,441.60 | 41,321.24 |
| 1981 | 44,189.46 | 42,807.16 |
| 1982 | 47,296.88 | 46,094.25 |
| 1983 | 49,391.27 | 49,178.52 |
| 1984 | 63,274.88 | 54,498.27 |
| 1985 | 67,078.95 | 53,685.87 |
| 1986 | 62,884.66 | 49,777.07 |
| 1987 | 67,469.17 | 55,780.26 |
| 1988 | 77,870.58 | 60,763.81 |
| 1989 | 77,742.71 | 60,336.11 |
| 1990 | 75,323.14 | 53,849.01 |
| 1991 | 78,411.81 | 55,937.33 |
| 1992 | 72,327.05 | 58,421.40 |
| 1993 | 76,093.66 | 55,048.33 |
| 1994 | 80,274.72 | 57,251.85 |
| 1995 | 82,652.41 | 58,457.78 |
| 1996 | 83,614.73 | 59,333.01 |
| 1997 | 86,722.75 | 62,955.82 |
| 1998 | 82,825.47 | 65,680.12 |
| 1999 | 79,894.81 | 65,292.49 |
| 2000 | 76,239.16 | 69,616.48 |
| 2001 | 77,553.12 | 68,336.69 |
| 2002 | 73,312.52 | 68,618.88 |
| 2003 | 68,513.06 | 68,554.95 |
| 2004 | 72,749.24 | 66,222.46 |
| 2005 | 72,030.54 | 66,434.10 |
| 2006 | 72,756.96 | 64,905.20 |
| 2007 | 76,460.73 | 63,615.49 |
| 2008 | 74,680.49 | 62,484.52 |
| 2009 | 69,377.27 | 54,423.32 |
| 2010 | 74,842.53 | 53,841.30 |
| 2011 | 73,980.52 | 47,122.71 |
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