what percentage of total miles of track were switching and classification yard lines in 2013?
Important information:
table_1: the route of 2013 is 31838 ; the route of 2012 is 31868 ;
table_4: the switching and classification yard lines of 2013 is 9090 ; the switching and classification yard lines of 2012 is 9046 ;
table_5: the total miles of 2013 is 50861 ; the total miles of 2012 is 50753 ;
Reasoning Steps:
Step: divide2-1(9090, 50861) = 18%
Program:
divide(9090, 50861)
Program (Nested):
divide(9090, 50861)

Please answer the following financial question based on the context provided. Make sure to give the answer in raw number, not in percentage and without any units. If the question asks for percentage the value should be less than 1
Context:
item 2 . properties we employ a variety of assets in the management and operation of our rail business . our rail network covers 23 states in the western two-thirds of the u.s . our rail network includes 31838 route miles . we own 26009 miles and operate on the remainder pursuant to trackage rights or leases . the following table describes track miles at december 31 , 2013 and 2012 . 2013 2012 .
Table
                                        | 2013  | 2012 
route                                   | 31838 | 31868
other main line                         | 6766  | 6715 
passing lines and turnouts              | 3167  | 3124 
switching and classification yard lines | 9090  | 9046 
total miles                             | 50861 | 50753
headquarters building we maintain our headquarters in omaha , nebraska . the facility has 1.2 million square feet of space for approximately 4000 employees and is subject to a financing arrangement . harriman dispatching center the harriman dispatching center ( hdc ) , located in omaha , nebraska , is our primary dispatching facility . it is linked to regional dispatching and locomotive management facilities at various locations along our .
Question: 
what percentage of total miles of track were switching and classification yard lines in 2013?
Important information:
table_1: the route of 2013 is 31838 ; the route of 2012 is 31868 ;
table_4: the switching and classification yard lines of 2013 is 9090 ; the switching and classification yard lines of 2012 is 9046 ;
table_5: the total miles of 2013 is 50861 ; the total miles of 2012 is 50753 ;
Reasoning Steps:
Step: divide2-1(9090, 50861) = 18%
Program:
divide(9090, 50861)
Program (Nested):
divide(9090, 50861)
