the table below details cash capital investments for the years ended december 31 , 2006 , 2005 , and 2004 . millions of dollars 2006 2005 2004 .

1	millions of dollars	2006	2005	2004
2	track	$ 1487	$ 1472	$ 1328
3	capacity and commercial facilities	510	509	347
4	locomotives and freight cars	135	98	125
5	other	110	90	76
6	total	$ 2242	$ 2169	$ 1876

in 2007 , we expect our total capital investments to be approximately $ 3.2 billion , which may include long- term leases . these investments will be used to maintain track and structures , continue capacity expansions on our main lines in constrained corridors , remove bottlenecks , upgrade and augment equipment to better meet customer needs , build and improve facilities and terminals , and develop and implement new technologies . we designed these investments to maintain infrastructure for safety , enhance customer service , promote growth , and improve operational fluidity . we expect to fund our 2007 cash capital investments through cash generated from operations , the sale or lease of various operating and non-operating properties , and cash on hand at december 31 , 2006 . we expect that these sources will continue to provide sufficient funds to meet our expected capital requirements for 2007 . for the years ended december 31 , 2006 , 2005 , and 2004 , our ratio of earnings to fixed charges was 4.4 , 2.9 , and 2.1 , respectively . the increases in 2006 and 2005 were driven by higher net income . the ratio of earnings to fixed charges was computed on a consolidated basis . earnings represent income from continuing operations , less equity earnings net of distributions , plus fixed charges and income taxes . fixed charges represent interest charges , amortization of debt discount , and the estimated amount representing the interest portion of rental charges . see exhibit 12 for the calculation of the ratio of earnings to fixed charges . financing activities credit facilities 2013 on december 31 , 2006 , we had $ 2 billion in revolving credit facilities available , including $ 1 billion under a five-year facility expiring in march 2009 and $ 1 billion under a five-year facility expiring in march 2010 ( collectively , the "facilities" ) . the facilities are designated for general corporate purposes and support the issuance of commercial paper . neither of the facilities were drawn on in 2006 . commitment fees and interest rates payable under the facilities are similar to fees and rates available to comparably rated investment-grade borrowers . these facilities allow for borrowings at floating rates based on london interbank offered rates , plus a spread , depending upon our senior unsecured debt ratings . the facilities require the maintenance of a minimum net worth and a debt to net worth coverage ratio . at december 31 , 2006 , we were in compliance with these covenants . the facilities do not include any other financial restrictions , credit rating triggers ( other than rating-dependent pricing ) , or any other provision that could require the posting of collateral . in addition to our revolving credit facilities , we had $ 150 million in uncommitted lines of credit available , including $ 75 million that expires in march 2007 and $ 75 million expiring in may 2007 . neither of these lines of credit were used as of december 31 , 2006 . we must have equivalent credit available under our five-year facilities to draw on these $ 75 million lines . dividends 2013 on january 30 , 2007 , we increased the quarterly dividend to $ 0.35 per share , payable beginning on april 2 , 2007 , to shareholders of record on february 28 , 2007 . we expect to fund the increase in the quarterly dividend through cash generated from operations , the sale or lease of various operating and non-operating properties , and cash on hand at december 31 , 2006 . dividend restrictions 2013 we are subject to certain restrictions related to the payment of cash dividends to our shareholders due to minimum net worth requirements under our credit facilities . retained earnings available .

Previous questions in this conversation: what was the cash capital investments in track in 2006? and for 2005?
Previous answers: 1487.0 1472.0
Question: so what was the difference between these two years?
Answer: 15