cash flows from operating activities can fluctuate significantly from period to period , as pension funding decisions , tax timing differences and other items can significantly impact cash flows .
in both 2007 and 2006 , the company made discretionary contributions of $ 200 million to its u.s .
qualified pension plan , and in 2005 made discretionary contributions totaling $ 500 million .
in 2007 , cash flows provided by operating activities increased $ 436 million , including an increase in net income of $ 245 million .
since the gain from sale of businesses is included in and increases net income , the pre-tax gain from the sale of the businesses must be subtracted , as shown above , to properly reflect operating cash flows .
the cash proceeds from the sale of the pharmaceuticals business are shown as part of cash from investing activities ; however , when the related taxes are paid they are required to be shown as part of cash provided by operating activities .
thus , operating cash flows for 2007 were penalized due to cash income tax payments of approximately $ 630 million in 2007 that related to the sale of the global branded pharmaceuticals business .
non-pharmaceutical related cash income tax payments were approximately $ 475 million lower than 2006 due to normal timing differences in tax payments , which benefited cash flows .
accounts receivable and inventory increases reduced cash flows in 2007 , but decreased cash flow less than in 2006 , resulting in a year-on-year benefit to cash flows of $ 323 million .
the category 201cother-net 201d in the preceding table reflects changes in other asset and liability accounts , including the impact of cash payments made in connection with 3m 2019s restructuring actions ( note 4 ) .
in 2006 , cash flows provided by operating activities decreased $ 365 million .
this decrease was due in large part to an increase of approximately $ 600 million in tax payments in 2006 compared with 2005 .
the higher tax payments in 2006 primarily related to the company 2019s repatriation of $ 1.7 billion of foreign earnings in the united states pursuant to the provisions of the american jobs creation act of 2004 .
the category 201cother-net 201d in the preceding table reflects changes in other asset and liability accounts , including outstanding liabilities at december 31 , 2006 , related to 3m 2019s restructuring actions ( note 4 ) .
cash flows from investing activities : years ended december 31 .

(Millions)
2007
2006
2005
Purchases of property, plant and equipment (PP&E)
$(1,422)
$(1,168)
$(943)
Proceeds from sale of PP&E and other assets
103
49
41
Acquisitions, net of cash acquired
(539)
(888)
(1,293)
Proceeds from sale of businesses
897
1,209
—
Purchases and proceeds from sale or maturities of marketable securities and investments — net
(406)
(662)
(46)
Net cash used in investing activities
$(1,367)
$(1,460)
$(2,241)

investments in property , plant and equipment enable growth in diverse markets , helping to meet product demand and increasing manufacturing efficiency .
in 2007 , numerous plants were opened or expanded internationally .
this included two facilities in korea ( respirator manufacturing facility and optical plant ) , an optical plant in poland , industrial adhesives/tapes facilities in both brazil and the philippines , a plant in russia ( corrosion protection , industrial adhesive and tapes , and respirators ) , a plant in china ( optical systems , industrial adhesives and tapes , and personal care ) , an expansion in canada ( construction and home improvement business ) , in addition to investments in india , mexico and other countries .
in addition , 3m expanded manufacturing capabilities in the u.s. , including investments in industrial adhesives/tapes and optical .
3m also exited several high-cost underutilized manufacturing facilities and streamlined several supply chains by relocating equipment from one facility to another .
the streamlining work has primarily occurred inside the u.s .
and is in addition to the streamlining achieved through plant construction .
as a result of this increased activity , capital expenditures were $ 1.422 billion in 2007 , an increase of $ 254 million when compared to 2006 .
the company expects capital expenditures to total approximately $ 1.3 billion to $ 1.4 billion in 2008 .
refer to the preceding 201ccapital spending/net property , plant and equipment 201d section for more detail .
refer to note 2 for information on 2007 , 2006 and 2005 acquisitions .
note 2 also provides information on the proceeds from the sale of businesses .
the company is actively considering additional acquisitions , investments and strategic alliances , and from time to time may also divest certain businesses .
purchases of marketable securities and investments and proceeds from sale ( or maturities ) of marketable securities and investments are primarily attributable to asset-backed securities , agency securities , corporate medium-term note securities , auction rate securities and other securities , which are classified as available-for-sale .
refer to note 9 for more details about 3m 2019s diversified marketable securities portfolio , which totaled $ 1.059 billion as of december 31 , 2007 .
purchases of marketable securities , net of sales and maturities , totaled $ 429 million for 2007 and $ 637 million for 2006 .
purchases of investments in 2005 include the purchase of 19% ( 19 % ) of ti&m beteiligungsgesellschaft mbh for .

Question: Analyse this data from a financial earnings document. what was the percentage change in the net cash used in investing activities from 2006 to 2007
Choices:
-0.0654
0.0637
-0.2291
-436.0637
-0.0637
Correct choice index: 4