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.

Text: ( 3 ) refer to note 2 201csummary of significant accounting principles and practices 201d for further information . 13 . employee benefitsp y defined contribution savings plans aon maintains defined contribution savings plans for the benefit of its employees . the expense recognized for these plans is included in compensation and benefits in the consolidated statements of income . the expense for the significant plans in the u.s. , u.k. , netherlands and canada is as follows ( in millions ) : . <table class='wikitable'><tr><td>1</td><td>years ended december 31</td><td>2018</td><td>2017</td><td>2016</td></tr><tr><td>2</td><td>u.s .</td><td>$ 98</td><td>$ 105</td><td>$ 121</td></tr><tr><td>3</td><td>u.k .</td><td>45</td><td>43</td><td>43</td></tr><tr><td>4</td><td>netherlands and canada</td><td>25</td><td>25</td><td>27</td></tr><tr><td>5</td><td>total</td><td>$ 168</td><td>$ 173</td><td>$ 191</td></tr></table> pension and other postretirement benefits the company sponsors defined benefit pension and postretirement health and welfare plans that provide retirement , medical , and life insurance benefits . the postretirement health care plans are contributory , with retiree contributions adjusted annually , and the aa life insurance and pension plans are generally noncontributory . the significant u.s. , u.k. , netherlands and canadian pension plans are closed to new entrants. .
Question: what portion of total benefit expense for plans in u.s. in 2018?
Answer: 0.58333
Question: what is the total benefit expense in 2018?
Answer: 168.0
Question: what about in 2017?

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173.0
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