List the number of warehouses Costco has. Segregate based on location in a descending order. Use the format ‘ Number of warehouse : Location’.
584 : United States
107 : Canada, 
40 : Mexico, 
31 : Japan, 
29 : the United Kingdom
18 : South Korea, 
14 : Taiwan, 
14 : Australia, 
4 : Spain, 
2 : France
2 : China
1 : Iceland
1 : New Zealand
1 : Sweden