VisitCountThisMonth__c
    false
    if ( 
case ( 
month( today()), 
1, ThisYear1__c, 
2, ThisYear2__c, 
3, ThisYear3__c, 
4, ThisYear4__c, 
5, ThisYear5__c, 
6, ThisYear6__c, 
7, ThisYear7__c, 
8, ThisYear8__c, 
9, ThisYear9__c, 
10, ThisYear10__c, 
11, ThisYear11__c, 
12, ThisYear12__c, 
-1 
) > 0, 
1, 
0 
)
    BlankAsZero
    
    18
    false
    0
    false
    Number
    false