Confirmed infections since first case detected on a non-linear scale1
Total cases (log scale)
Days since first case detected
1 This chart shows the rate at which Covid-19 cases rise and fall, allowing us to compare the outbreak between countries. Most graphs are linear, meaning the numbers on the vertical axis increase steadily. With this graph, each interval on the vertical axis represents a 10-times increase. This is a better way to compare percentage changes. For instance, when case numbers double from 10 to 20 or from 100 to 200, they will be represented by the same vertical jump on the chart. This is useful for a country like New Zealand with a small population, because it allows us to see relative changes, without the graph being swamped by numbers in populous countries such as China.