filter contacts by sales volume through conversions

filter contacts by sales volume through conversions

Hey Guys,...

i'm owning a medical practice and i'm using zoho crm for my customer loyalty.

HOW can I filter my contacts so that I can find out who are the contacts that i'm making the most money with.
I'm adding sales volume through conversion function. I'm not using products or invoice function.
can i filter contacts so that i can see which contact did the highest sales volume through conversions summarized for the current year?

thanks for your help.