increased over 4% ( 4 % ) in 2005 , costs for trucking services provided by intermodal carriers remained flat as we substantially reduced expenses associated with network inefficiencies . higher diesel fuel prices increased sales and use taxes in 2005 , which resulted in higher state and local taxes . other contract expenses for equipment maintenance and other services increased in 2005 . the 2005 january west coast storm and hurricanes katrina and rita also contributed to higher expenses in 2005 ( net of insurance settlements received ) . partially offsetting these increases was a reduction in relocation expenses as we incurred higher relocation costs associated with moving support personnel to omaha , nebraska during 2004 . non-operating items millions of dollars 2006 2005 2004 % (  % ) change 2006 v 2005 % (  % ) change 2005 v 2004 .

2006: other income: 118
interest expense: -477
income taxes: -919
2005: other income: 145
interest expense: -504
income taxes: -410
2004: other income: 88
interest expense: -527
income taxes: -252
% (  % ) change 2006 v 2005: other income: -19
interest expense: -5
income taxes: 124
% (  % ) change 2005 v 2004: other income: -65
interest expense: -4
income taxes: 63

other income 2013 lower net gains from non-operating asset sales and higher expenses due to rising interest rates associated with our sale of receivables program resulted in a reduction in other income in 2006 , which was partially offset by higher rental income for the use of our right-of-way ( including 2006 settlements of rate disputes from prior years ) and cash investment returns due to higher interest rates . in 2005 , other income increased largely as a result of higher gains from real estate sales partially offset by higher expenses due to rising interest rates associated with our sale of receivables program . interest expense 2013 lower interest expense in 2006 and 2005 was primarily due to declining weighted-average debt levels of $ 7.1 billion , $ 7.8 billion , and $ 8.1 billion in 2006 , 2005 , and 2004 , respectively . a higher effective interest rate of 6.7% ( 6.7 % ) in 2006 , compared to 6.5% ( 6.5 % ) in both 2005 and 2004 , partially offset the effects of the declining debt level . income taxes 2013 income tax expense was $ 509 million higher in 2006 than 2005 . higher pre-tax income resulted in additional taxes of $ 414 million and $ 118 million of the increase resulted from the one-time reduction in 2005 described below . our effective tax rate was 36.4% ( 36.4 % ) and 28.6% ( 28.6 % ) in 2006 and 2005 , respectively . income taxes were greater in 2005 than 2004 due to higher pre-tax income partially offset by a previously reported reduction in income tax expense . in our quarterly report on form 10-q for the quarter ended june 30 , 2005 , we reported that the corporation analyzed the impact that final settlements of pre-1995 tax years had on previously recorded estimates of deferred tax assets and liabilities . the completed analysis of the final settlements for pre-1995 tax years , along with internal revenue service examination reports for tax years 1995 through 2002 were considered , among other things , in a review and re-evaluation of the corporation 2019s estimated deferred tax assets and liabilities as of september 30 , 2005 , resulting in an income tax expense reduction of $ 118 million in .

Questions:
what is the other income in 2006?
what about in 2005?
what is the sum for these two years?
what about in 2004?
what is the total for three years?
what is the average for these three years?
what is the net change in other income from 2004 to 2005?

Answers:
118
145
263
88
351
117
57