Web Administration Domino Utilization

I used to check my domino server using webadmin. When I am checking platform statistics I found domino utilization domino utilization is above 100% some time its reaching 180% also(Server->Status->Operating System → Platform Statistics)

Exp:-

When as RAM utilization is 50% CPU utilization is below 50% nic /bandwidth hardly 5% domino utilization shows 180%.

What can be the problem which parameters I have to check to resolve this problem?