|
| year | production | consumption |
| 1980 | 3,796,862.00 | 3,752,173.00 |
| 1981 | 3,839,986.00 | 3,842,971.00 |
| 1982 | 3,996,360.00 | 3,934,206.00 |
| 1983 | 4,038,027.00 | 4,052,016.00 |
| 1984 | 4,286,652.00 | 4,295,920.00 |
| 1985 | 4,463,249.00 | 4,466,703.00 |
| 1986 | 4,589,461.00 | 4,557,155.00 |
| 1987 | 4,711,287.00 | 4,716,073.00 |
| 1988 | 4,832,955.00 | 4,870,025.00 |
| 1989 | 4,917,077.00 | 4,879,230.00 |
| 1990 | 4,969,011.00 | 4,876,462.00 |
| 1991 | 4,866,332.00 | 4,852,972.00 |
| 1992 | 4,804,629.00 | 4,763,499.00 |
| 1993 | 4,774,683.00 | 4,851,878.00 |
| 1994 | 4,849,403.00 | 4,899,160.00 |
| 1995 | 4,988,421.00 | 4,991,184.00 |
| 1996 | 5,064,471.00 | 5,108,139.00 |
| 1997 | 5,155,713.00 | 5,124,380.00 |
| 1998 | 5,164,229.00 | 5,143,400.00 |
| 1999 | 5,034,920.00 | 5,066,957.00 |
| 2000 | 5,140,093.00 | 5,281,835.00 |
| 2001 | 5,388,330.00 | 5,328,020.00 |
| 2002 | 5,443,230.00 | 5,438,449.00 |
| 2003 | 5,756,116.00 | 5,786,472.00 |
| 2004 | 6,059,116.00 | 6,094,762.00 |
| 2005 | 6,543,011.00 | 6,492,269.00 |
| 2006 | 6,881,185.00 | 6,801,781.00 |
| 2007 | 7,153,159.00 | 7,103,233.00 |
| 2008 | 7,414,697.00 | 7,316,677.00 |
| 2009 | 7,658,084.00 | 7,487,077.00 |
| 2010 | 7,954,052.00 | 7,770,280.00 |
| 2011 | 8,460,907.00 | 8,144,308.00 |
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