The Defense Department‘s base budget increased to $502 billion in fiscal year 2014 from $384 billion in FY 2000.

The Congressional Budget Office said Thursday the inflation-adjusted growth represents a 31 percent increase and a 1.9 percent annual average growth rate.

Military personnel costs accounted for 46 percent of the growth rate over the period, those for operation and maintenance expenditures saw a 34 percent increase, while acquisition registered a 25 percent rise.

Nearly two-thirds of the budget increase went for procurement; operation and maintenance costs for the Defense health program; research, development, test and evaluation; basic housing allowance; fuel and active-duty military personnel pay.

DoD’s base budget comprises both discretionary and mandatory funding.