| Year | Value | | 2011 | 1,455,413,449.9221 | | 2010 | 1,420,136,165.547 | | 2009 | 1,672,198,400.249 | | 2008 | 1,219,762,851.4472 | | 2007 | 1,166,850,638.5742 | | 2006 | 1,072,597,634.9161 | | 2005 | 958,336,964.28778 | | 2004 | 955,112,339.36241 | | 2003 | 744,272,207.61148 | | 2002 | 631,412,912.38118 | | 2001 | 646,900,811.46115 | | 2000 | 604,651,378.84726 | | 1999 | 598,784,605.33478 | | 1998 | 625,939,364.04943 | | 1997 | 564,226,859.58248 | | 1996 | 567,704,000.54016 | | 1995 | 482,635,335.10526 | | 1994 | 456,989,184.98545 | | 1993 | 404,509,952.84803 |
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