There are ongoing discussions across both New Zealand & Australia about relaxing border controls between the two countries given their current COVID19 status.
Point of Maximum risk is taken as the Peak of the 2 Sigma Upper Bollinger Band
Current risk is taken as the (Current Upper Bollinger Band) / (Peak Upper Bollinger Band)
NZ risk level = 8%
AU risk level =10%
Open Border Risk = SQRT(0.08*0.10)= 9% Risk