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.


future minimum lease commitments for office premises and equipment under non-cancelable leases , along with minimum sublease rental income to be received under non-cancelable subleases , are as follows : period rent obligations sublease rental income net rent . <table class='wikitable'><tr><td>1</td><td>period</td><td>rent obligations</td><td>sublease rental income</td><td>net rent</td></tr><tr><td>2</td><td>2008</td><td>$ 323.9</td><td>$ -40.9 ( 40.9 )</td><td>$ 283.0</td></tr><tr><td>3</td><td>2009</td><td>300.9</td><td>-37.5 ( 37.5 )</td><td>263.4</td></tr><tr><td>4</td><td>2010</td><td>267.7</td><td>-31.0 ( 31.0 )</td><td>236.7</td></tr><tr><td>5</td><td>2011</td><td>233.7</td><td>-25.7 ( 25.7 )</td><td>208.0</td></tr><tr><td>6</td><td>2012</td><td>197.9</td><td>-20.2 ( 20.2 )</td><td>177.7</td></tr><tr><td>7</td><td>2013 and thereafter</td><td>871.0</td><td>-33.1 ( 33.1 )</td><td>837.9</td></tr><tr><td>8</td><td>total</td><td>$ 2195.1</td><td>$ -188.4 ( 188.4 )</td><td>$ 2006.7</td></tr></table> guarantees we have certain contingent obligations under guarantees of certain of our subsidiaries ( 201cparent company guarantees 201d ) relating principally to credit facilities , guarantees of certain media payables and operating leases . the amount of such parent company guarantees was $ 327.1 and $ 327.9 as of december 31 , 2007 and 2006 , respectively . in the event of non-payment by the applicable subsidiary of the obligations covered by a guarantee , we would be obligated to pay the amounts covered by that guarantee . as of december 31 , 2007 , there are no material assets pledged as security for such parent company guarantees . contingent acquisition obligations we have structured certain acquisitions with additional contingent purchase price obligations in order to reduce the potential risk associated with negative future performance of the acquired entity . in addition , we have entered into agreements that may require us to purchase additional equity interests in certain consolidated and unconsolidated subsidiaries . the amounts relating to these transactions are based on estimates of the future financial performance of the acquired entity , the timing of the exercise of these rights , changes in foreign currency exchange rates and other factors . we have not recorded a liability for these items since the definitive amounts payable are not determinable or distributable . when the contingent acquisition obligations have been met and consideration is determinable and distributable , we record the fair value of this consideration as an additional cost of the acquired entity . however , we recognize deferred payments and purchases of additional interests after the effective date of purchase that are contingent upon the future employment of owners as compensation expense . compensation expense is determined based on the terms and conditions of the respective acquisition agreements and employment terms of the former owners of the acquired businesses . this future expense will not be allocated to the assets and liabilities acquired and is amortized over the required employment terms of the former owners . the following table details the estimated liability with respect to our contingent acquisition obligations and the estimated amount that would be paid under the options , in the event of exercise at the earliest exercise date . all payments are contingent upon achieving projected operating performance targets and satisfying other notes to consolidated financial statements 2014 ( continued ) ( amounts in millions , except per share amounts ) .
Question: what was the parent company gaurantees as of 12/31/07?
Answer: 327.1
Question: and as of 12/31/06?

327.9