The file Audits contains the number of audits of corporations with assets of more than $250 million

Question:

The file Audits contains the number of audits of corporations with assets of more than $250 million conducted by the Internal Revenue Service between 2001 and 2012. (Data extracted from www.irs.gov.)
a. Construct a time-series plot.
b. What pattern, if any, is present in the data?