Final answer:
The percentage of change from 2020 to 2021 is -6% and from 2021 to 2022 is 10%.
Step-by-step explanation:
To calculate the percentage of change from one year to another, we can use the formula:
Percentage Change = [(New Value - Old Value)/Old Value] × 100%
(a) To find the percentage of change from 2020 to 2021:
Percentage Change = [(473,000 - 503,000)/503,000] × 100% = -6%
(b) To find the percentage of change from 2021 to 2022:
Percentage Change = [(521,000 - 473,000)/473,000] × 100% = 10%