for additional information on segment results see page 43 .
income from equity method investments increased by $ 126 million in 2006 from 2005 and increased by $ 98 million in 2005 from 2004 .
income from our lpg operations in equatorial guinea increased in both periods due to higher sales volumes as a result of the plant expansions completed in 2005 .
the increase in 2005 also included higher ptc income as a result of higher distillate gross margins .
cost of revenues increased $ 4.609 billion in 2006 from 2005 and $ 7.106 billion in 2005 from 2004 .
in both periods the increases were primarily in the rm&t segment and resulted from increases in acquisition costs of crude oil , refinery charge and blend stocks and purchased refined products .
the increase in both periods was also impacted by higher manufacturing expenses , primarily the result of higher contract services and labor costs in 2006 and higher purchased energy costs in 2005 .
purchases related to matching buy/sell transactions decreased $ 6.968 billion in 2006 from 2005 and increased $ 3.314 billion in 2005 from 2004 , mostly in the rm&t segment .
the decrease in 2006 was primarily related to the change in accounting for matching buy/sell transactions discussed above .
the increase in 2005 was primarily due to increased crude oil prices .
depreciation , depletion and amortization increased $ 215 million in 2006 from 2005 and $ 125 million in 2005 from 2004 .
rm&t segment depreciation expense increased in both years as a result of the increase in asset value recorded for our acquisition of the 38 percent interest in mpc on june 30 , 2005 .
in addition , the detroit refinery expansion completed in the fourth quarter of 2005 contributed to the rm&t depreciation expense increase in 2006 .
e&p segment depreciation expense for 2006 included a $ 20 million impairment of capitalized costs related to the camden hills field in the gulf of mexico and the associated canyon express pipeline .
natural gas production from the camden hills field ended in 2006 as a result of increased water production from the well .
selling , general and administrative expenses increased $ 73 million in 2006 from 2005 and $ 134 million in 2005 from 2004 .
the 2006 increase was primarily because personnel and staffing costs increased throughout the year primarily as a result of variable compensation arrangements and increased business activity .
partially offsetting these increases were reductions in stock-based compensation expense .
the increase in 2005 was primarily a result of increased stock-based compensation expense , due to the increase in our stock price during that year as well as an increase in equity-based awards , which was partially offset by a decrease in expense as a result of severance and pension plan curtailment charges and start-up costs related to egholdings in 2004 .
exploration expenses increased $ 148 million in 2006 from 2005 and $ 59 million in 2005 from 2004 .
exploration expense related to dry wells and other write-offs totaled $ 166 million , $ 111 million and $ 47 million in 2006 , 2005 and 2004 .
exploration expense in 2006 also included $ 47 million for exiting the cortland and empire leases in nova scotia .
net interest and other financing costs ( income ) reflected a net $ 37 million of income for 2006 , a favorable change of $ 183 million from the net $ 146 million expense in 2005 .
net interest and other financing costs decreased $ 16 million in 2005 from 2004 .
the favorable changes in 2006 included increased interest income due to higher interest rates and average cash balances , foreign currency exchange gains , adjustments to interest on tax issues and greater capitalized interest .
the decrease in expense for 2005 was primarily a result of increased interest income on higher average cash balances and greater capitalized interest , partially offset by increased interest on potential tax deficiencies and higher foreign exchange losses .
included in net interest and other financing costs ( income ) are foreign currency gains of $ 16 million , losses of $ 17 million and gains of $ 9 million for 2006 , 2005 and 2004 .
minority interest in income of mpc decreased $ 148 million in 2005 from 2004 due to our acquisition of the 38 percent interest in mpc on june 30 , 2005 .
provision for income taxes increased $ 2.308 billion in 2006 from 2005 and $ 979 million in 2005 from 2004 , primarily due to the $ 4.259 billion and $ 2.691 billion increases in income from continuing operations before income taxes .
the increase in our effective income tax rate in 2006 was primarily a result of the income taxes related to our libyan operations , where the statutory income tax rate is in excess of 90 percent .
the following is an analysis of the effective income tax rates for continuing operations for 2006 , 2005 and 2004 .
see note 11 to the consolidated financial statements for further discussion. .

2006
2005
2004
statutory u.s . income tax rate
35.0% ( 35.0 % )
35.0% ( 35.0 % )
35.0% ( 35.0 % )
effects of foreign operations including foreign tax credits
9.9
-0.8 ( 0.8 )
0.5
state and local income taxes net of federal income tax effects
1.9
2.5
1.6
other tax effects
-2.0 ( 2.0 )
-0.4 ( 0.4 )
-0.9 ( 0.9 )
effective income tax rate for continuing operations
44.8% ( 44.8 % )
36.3% ( 36.3 % )
36.2% ( 36.2 % )

.

Question: by what percentage did effects of foreign operations including foreign tax credits increase from 2004 to 2006?
Answer: 1880%