2009/20092009=2009/(10001X2009)=1/10001
2008/20082008=2008/(10001X2008)=1/10001
2009/20092009-2008/20082008=1/10001-1/10001=0
2009/20092009=2009/(10001X2009)=1/10001
2008/20082008=2008/(10001X2008)=1/10001
2009/20092009-2008/20082008=1/10001-1/10001=0