How to control the increment of progress bar.

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C#

I'm using the following code:

private void button1_Click(object sender, EventArgs e)
        {
            backgroundWorker1.RunWorkerAsync();
        }


        private void backgroundWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e)
        {
            progressBar1.Value = e.ProgressPercentage;
        }

        private void backgroundWorker1_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
        {
            MessageBox.Show("Complete");
        }


        private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
        {

            int[] arr = new int[20];
            for (int i = 1; i <= 20; i++)
            {
                arr[i] = i;
                Thread.Sleep(100);
                backgroundWorker1.ReportProgress(i);
            }
        }

This only increments the progress bar only to 20% by the time the control exits the for loop. I want the progress bar to increment to 100% by the time the for loop completes the 20 loops proportionally. eg/- the progress bar should increment by 5% (as in (1/20)*100)) after the first loop is complete . Please help.