notes to consolidated financial statements at december 31 , 2007 , future minimum rental payments required under operating leases for continuing operations that have initial or remaining noncancelable lease terms in excess of one year , net of sublease rental income , most of which pertain to real estate leases , are as follows : ( millions ) .
aon corporation .
2008 $317
2009 275
2010 236
2011 214
2012 191
Later years 597
Total minimum payments required $1,830
2008 $ 317
2009 275
2010 236
2011 214
2012 191
later years 597
total minimum payments required $ 1830
what is the percentual decrease observed in the future minimum rental payments during 2008 and 2009?