question: how many percent was funded by the department of defense?
table.cells: ffrdc all federal r&d expenditures
table.cells: all ffrdcs 18855593
table.cells: department of defense 4194659
table.cells: department of energy 9849051
table.cells: department of health and human services 867042
table.cells: department of homeland security 504086
table.cells: department of transportation 162645
table.cells: national aeronautics and space administration 2013307
table.cells: national science foundation 244042
table.cells: other 1020761