MINERALS TECHNOLOGIES INC. AND SUBSIDIARY COMPANIES  NOTES TO CONSOLIDATED FINANCIAL STATEMENTS  Plan Assets and our historical return, taking into account current and expected market conditions. The actual return on pension assets was  approximately 14% in 2013, 9% in 2012 and 2% in 2011.  The Company maintains a self-funded health insurance plan for its retirees. This plan provided that the maximum health  care cost trend rate would be 5%. Effective June 2010, the Company amended its plan to change the eligibility requirement  for retirees and revised its plan so that increases in expected health care costs would be borne by the retiree. The Company's pension plan weighted average asset allocation percentages at December 31, 2013 and 2012 by asset  category are as follows:  Asset Category  2013  2012  Equity securities .............................................. 56.4% 56.4%  Fixed income securities ................................... 35.0% 34.9%  Real estate........................................................ 0.5% 0.5%  Other ................................................................ 8.1% 8.2%  Total ...................................................... 100.0% 100.0%  Millions of Dollars Asset Category  2013  2012  Equity securities ..............................................  $  135.9  $  119.5  Fixed income securities ................................... 84.2  74.1  Real estate........................................................ 1.1  1.0  Other ................................................................ 19.5  17.4  Total ...................................................... $  240.7  $  212.0  U.S. Plans  International Plans  Millions of Dollars  2013 2012  2011  2013 2012  2011 Fair value of plan assets.................... $ 170.6  $  148.2  $  132.2  $  70.1 $  63.8  $ 55.3  Millions of Dollars  Pension Assets at Fair Value as of December 31, 2013  Asset Class  Quoted  Prices In Active  Markets for Identical  Assets Significant  Other Observable  Inputs Significant Unobservable  Inputs Total  (Level 1)  (Level 2)  (Level 3)  Equity Securities.......................................................... US equities.............................................................. $  116.8 $  -- $  -- $ 116.8  Non-US equities ..................................................... 19.0 -- -- 19.0  Fixed Income Securities  Corporate debt instruments..................................... 53.7 30.6  -- 84.3  Real estate and other Real estate ............................................................... -- -- 1.1  1.1  Other ....................................................................... -- -- 19.5  19.5  Total Assets ................................................................. $  189.5 $  30.6  $  20.6  $ 240.7  U.S. equities — This class included actively and passively managed common equity securities comprised primarily of large- capitalization stocks with value, core and growth strategies.  The following table summarizes our defined benefit pension plan assets measured at fair value as of December 31, 2013:  The following table presents domestic and foreign pension plan assets information at December 31, 2013, 2012 and 2011  (the measurement date of pension plan assets):  The Company's pension plan fair values at December 31, 2013 and 2012 by asset category are as follows:  F-23 