Change the time series to go back only one year
Change the time series to go back only one year

https://seedscientific.atlassian.net/browse/POLIO-482

Immunity Gap, Missed Children, Conversins, and the number of
inaccessible children now all go back only one year, as per
UNICEF's request.

unicef/rhizome,unicef/polio,SeedScientific/polio,unicef/rhizome,unicef/rhizome,SeedScientific/polio,SeedScientific/polio,SeedScientific/polio,unicef/polio,unicef/rhizome,SeedScientific/polio,unicef/polio,unicef/polio