How to create donut chart in Visualforce page using Apex in Salesforce?

Sample code:

Visualforce page:

<apex:page controller="Graph" >
    <apex:pageblock title="Members and their Years of experience" >
        <apex:chart height="250" width="350" data="{!pieData}">
            <apex:pieSeries tips="true" dataField="data" labelField="name" donut="50"/>
            <apex:legend position="bottom"/>

Apex Controller:

public class Graph

    public List<PieWedgeData> getPieData()
        List<PieWedgeData> data = new List<PieWedgeData>();
        List<Member__c> memb = new List<Member__c>(); 
        String sql = 'SELECT Name, Year_s_Of_Experience__c FROM Member__c';
        memb = Database.Query(sql);
        for(Member__c temp:memb)
            data.add(new PieWedgeData(temp.Name,temp.Year_s_Of_Experience__c));
        return data; 
    // Wrapper class 
    public class PieWedgeData
        public String name { get; set; } 
        public Decimal data { get; set; } 
        public PieWedgeData(String name, Decimal data)
   = name; 
   = data; 



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