Number of service requests to NYC’s 311 from 2004 to 2016:  24,537,397
Top 10 agencies (of 65) with the most requests:
HPD
8110359
NYPD
4017361
DOT
3676805
DEP
2435830
DSNY
1771932
DOB
1362758
DPR
931293
DOHMH
629524
DOF
541761
DCA
312950

Bottom 5 with only 1 service request each:

61
OEM
1
62
OMB
1
63
TFA
1
64   
LPC
1
65 
TAT
1
OEM everyone knows, after 9/11.  What’s TAT?  ‘That’ with an ‘h’ missing? 

311 data from NYC Open Data, downloaded at various times.  As of Feb 19, 2017, 24.5 million rows,  52 variables till 2009,  53 variables from 2010. Parsed using R v3.3.1 in RStudio v1.0.136