Results for 2010:
Store #1 monthly average was $10.0
Store #2 monthly average was $5.5
The least-profitable store based on yearly totals was store #2, with a profit of $66.0
The store with the highest monthly sale was store #2, with a sale of $11.0
The total for all stores over the month of December was $21.0

Results for 2011:
Store #1 monthly average was $8.416666666666666
Store #2 monthly average was $50.0
Store #3 monthly average was $91.66666666666667
The least-profitable store based on yearly totals was store #1, with a profit of $101.0
The store with the highest monthly sale was store #1, with a sale of $101.0
The total for all stores over the month of December was $201.0

Results for 2012:
Store #1 monthly average was $438.3625
Store #2 monthly average was $334.12916666666666
Store #3 monthly average was $137.55166666666665
The least-profitable store based on yearly totals was store #3, with a profit of $1650.62
The store with the highest monthly sale was store #1, with a sale of $895.2
The total for all stores over the month of December was $525.0

Results for 2013:
Store #1 monthly average was $4074.8333333333335
Store #2 monthly average was $1235.7358333333334
Store #3 monthly average was $694.0
Store #4 monthly average was $5058.908333333334
The least-profitable store based on yearly totals was store #3, with a profit of $8328.0
The store with the highest monthly sale was store #4, with a sale of $9999.0
The total for all stores over the month of December was $15764.0

Results for 2014:
Store #1 monthly average was $6.5
Store #2 monthly average was $6.5
Store #3 monthly average was $6.5
Store #4 monthly average was $6.5
The least-profitable store based on yearly totals was store #1, with a profit of $78.0
The store with the highest monthly sale was store #3, with a sale of $78.0
The total for all stores over the month of December was $19.5