title: Generate percent change between annual observations in Stata?
body: <p>How do I use the <code>gen</code> or <code>egen</code> commands to generate the percent change between observations for different years in Stata? For example, I have observations for 1990 through 2010, each with a different value for expenditures, and I'm trying to generate a new observation with the percent change from 1990-1991, 1991-1992, etc.</p>