It fell steadily until it dropped as low as $ 2.93 billion in 1998 and rose gradually to $ 3.27 billion for fiscal 2002 .
The budget fell steadily until dropping as low as $ 2.93 billion in 1998 and has gradually risen to $ 3.27 billion for fiscal 2002 .
a term used to summarize the spread of values around the mean. 68% fall within +/- 1 sd 95% fall within +/- 2 sd.