The processing time in other countries are also round the 16 month timeline:
"Spouse or common-law partner living outside Canada
Submitted before December 7, 2016
Senegal
13 month(s)
?
Includes assessment of sponsor.
View your
application status online
We’re working to finalize applications received before December 7, 2016 by the end of December 2017"
This is what it says for applications from Senegal but I have seen applications sent o Dakar processed in less than 5 months.
Accra is just something else.