The bar chart illustrates the total number of minutes, measured in billions, spent on telephone calls in Australia across three distinct categories between 2001 and 2008.
Overall, local calls were the primary method of communication for the majority of the period, peaking in 2005. Conversely, mobile phone calls witnessed a significant and sustained increase throughout the eight years, while national and international calls showed a steady, gradual rise.
In 2001, local calls stood at 72 billion minutes, climbing steadily to reach a peak of 90 billion in 2005. Following this, the figure began a downward trend, returning to 72 billion by 2008. Meanwhile, national and international calls started at 38 billion minutes in 2001 and grew consistently each year, finishing at 61 billion in 2008, thereby overtaking local calls as the most frequent category by the end of the period.
Mobile phone usage began at a negligible 2 billion minutes in 2001. This category experienced rapid growth, particularly after 2005, jumping from 12 billion to 23 billion in 2006, and continuing to surge to 46 billion by 2008. Consequently, mobile calls became a substantial component of total Australian telephone traffic by the end of the timeframe.