The "H-1B Approval Rate" chart has two problems with the y-axis: 1) the 75 and 100 grid lines should display and marked, 2) it is misleading by setting the y-axis range at 75 to 100. Because it gives reader an impression that approval rate drops to almost zero.

If you want to emphasize the disapproval rate, just make a disapproval rate chart, which can have the y-axis range at 0 to 25.