At the start of a biological monitoring programme in 2023, the population of an invasive species of zebra mussel in a freshwater lake was estimated to be 5.4 million5.4 \text{ million}5.4 million. It is estimated that, on average, another zebra mussel successfully matures in this lake every 40 seconds40 \text{ seconds}40 seconds.
Assuming no zebra mussels in the lake died during 2023, calculate the annual percentage increase in the population of mature zebra mussels for 2023. Assume there are 365 days in the year. Give your answer to 3 significant figures.
