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.


management 2019s discussion and analysis 74 jpmorgan chase & co./2017 annual report treasury and cio overview treasury and cio is predominantly responsible for measuring , monitoring , reporting and managing the firm 2019s liquidity , funding and structural interest rate and foreign exchange risks , as well as executing the firm 2019s capital plan . the risks managed by treasury and cio arise from the activities undertaken by the firm 2019s four major reportable business segments to serve their respective client bases , which generate both on- and off-balance sheet assets and liabilities . treasury and cio seek to achieve the firm 2019s asset-liability management objectives generally by investing in high- quality securities that are managed for the longer-term as part of the firm 2019s investment securities portfolio . treasury and cio also use derivatives to meet the firm 2019s asset- liability management objectives . for further information on derivatives , see note 5 . the investment securities portfolio primarily consists of agency and nonagency mortgage- backed securities , u.s . and non-u.s . government securities , obligations of u.s . states and municipalities , other abs and corporate debt securities . at december 31 , 2017 , the investment securities portfolio was $ 248.0 billion , and the average credit rating of the securities comprising the portfolio was aa+ ( based upon external ratings where available and where not available , based primarily upon internal ratings that correspond to ratings as defined by s&p and moody 2019s ) . see note 10 for further information on the details of the firm 2019s investment securities portfolio . for further information on liquidity and funding risk , see liquidity risk management on pages 92 201397 . for information on interest rate , foreign exchange and other risks , see market risk management on pages 121-128 . selected income statement and balance sheet data as of or for the year ended december 31 , ( in millions ) 2017 2016 2015 . <table class='wikitable'><tr><td>1</td><td>as of or for the year ended december 31 ( in millions )</td><td>2017</td><td>2016</td><td>2015</td></tr><tr><td>2</td><td>securities gains/ ( losses )</td><td>$ -78 ( 78 )</td><td>$ 132</td><td>$ 190</td></tr><tr><td>3</td><td>afs investment securities ( average )</td><td>219345</td><td>226892</td><td>264758</td></tr><tr><td>4</td><td>htm investment securities ( average )</td><td>47927</td><td>51358</td><td>50044</td></tr><tr><td>5</td><td>investment securities portfolio ( average )</td><td>267272</td><td>278250</td><td>314802</td></tr><tr><td>6</td><td>afs investment securities ( period-end )</td><td>200247</td><td>236670</td><td>238704</td></tr><tr><td>7</td><td>htm investment securities ( period-end )</td><td>47733</td><td>50168</td><td>49073</td></tr><tr><td>8</td><td>investment securities portfolio ( period 2013end )</td><td>247980</td><td>286838</td><td>287777</td></tr></table> afs investment securities ( average ) 219345 226892 264758 htm investment securities ( average ) 47927 51358 50044 investment securities portfolio ( average ) 267272 278250 314802 afs investment securities ( period-end ) 200247 236670 238704 htm investment securities ( period-end ) 47733 50168 49073 investment securities portfolio ( period 2013end ) 247980 286838 287777 .
Question: what is the ratio of afs investment securities period-end to average in 2017?

0.91293