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 ) . 2008                            | $ 317 
2009                            | 275   
2010                            | 236   
2011                            | 214   
2012                            | 191   
later years                     | 597   
total minimum payments required | $ 1830 aon corporation .
Question: what is the difference between the net rent expense of the years 2009 and 2008?

Read the following texts and table with financial data from an S&P 500 earnings report carefully.Based on the question-answer history (if provided), answer the last question. The answer may require mathematical calculation based on the data provided.
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 ) . 2008                            | $ 317 
2009                            | 275   
2010                            | 236   
2011                            | 214   
2012                            | 191   
later years                     | 597   
total minimum payments required | $ 1830 aon corporation .
Question: what is the difference between the net rent expense of the years 2009 and 2008?
