Hi Sue, I responded to another related comment several weeks ago, and I will paste my relevant response here: 
 

Regarding tropical cyclones, the relationship La Nina and tropical cyclones in the southwest Indian Ocean is a bit challenging to discern. This study suggests that La Nina causes less frequent than normal cyclone occurrences, but this one also suggests that La Nina leads to stronger and longer-lived cyclones in the region. Therefore, the relationship between cyclones and La Nina over the southwest Indian Ocean may be complex and not fully understood.