When frequencies of several categories of a variable are available over time, a stacked area chart can be constructed. The figure below illustrates the monthly behavior of different types of bankruptcies in Puerto Rico, an island in the Caribbean, from 2000 to mid 2018. The y axis shows relative frequencies and the x axis displays time.

a) Overall, what type (chapter) of bankruptcy is most common?
b) Overall, what types (chapter) of bankruptcy are the least common?
c) A new bankruptcy law to reduce the frequency of Chapter 7 bankruptcies was created in October 2005. Did the law work?

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Jan/00 Nov/00 Sep/01 Jul/02 May/03 Mar/04 Jan/05 Nov/05 Sep/06 Jul/07 May/08 Mar/09 Jan/10 Nov/10 Sep/11 Jul/12 May/13 Mar/14 Jan/15 Nov/15 Sep/16 Jul/17 May/18 Mar/19 0.00 0.25 0.50 0.75 Law. Oct/05: Collapse. Sep/08: New Bankruptcy Lehman Brothers; 1.00 Chapter Ch.7 Ch.11 Ch.12 Ch.13