The line graph illustrates the amount number of foreigners in millions, who visited Australia over the period 1975 to 2005.(space)It can be seen that the number of these visitors constantly grew consistently, rising from just under 10(space)million in 1975 to just over 30(space)million in 2005. 

Besides, the table (you haven't pasted the table) gives the data and indicates the proportion of these overseas visitors from six countries in 1975 and 2005. It is strictly related to the line graph. (reframe this sentence) 

In 1975, the visitors from both Japan and South Korea account accounted for almost two third two-thirds of the total. The pattern in 2005 was similar. That means they occupied the majority of the amount number of visitors.

On the other hand, there are were a few travelers who come from China(0.3million) and USA(0.4million) in 2005 although it had doubled the figure in 1975. It demonstrates that China and USA were not the most important visitor sources.

In conclusion, the Australia Australian government could put in more effort to promote their city for these potential countries, i.e. China and Japan (eg. China and USA) and also keep the rate of increase of South Korea and Japan.