ROTISSERIE: Where have all the steALs gone?

Recent MLB trends regarding the decline of stolen bases have been analyzed in a number of outlets, including the 2017 Baseball Forecaster ("Devaluation" and "2016 Trends, 2017 Responses" essays), as well as the 9/23/2016 BaseballHQ Radio podcast with Patrick Davitt and Joe Sheehan. A deeper dive into the data raises some particular findings for those in AL or NL "only" leagues, which will be explored here. 

Macro Level Analysis

Yes, as hinted in this article's title, there has been a major stolen base adjustment in the American League.

AL   2013  2014  2015  2016
===  ====  ====  ====  ====
SB   1428  1394  1185  1149
CS    513   492   533   448
SB%   74%   74%   69%   72%
SBO  8.9%  8.8%  8.2%  7.5%
                
NL   2013  2014 ...

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