请根据以下图表描述，总结六国在2016至2018年间对发展中国家提供的援助的主要特征和比较。请控制在150字以内。（15分）

The given chart illustrates the financial aid provided by six developed nations to developing countries during the years 2016 to 2018. The main features of this chart can be summarized as follows:

1. The US was the leading donor, providing consistently over 20 billion dollars in aid each year.
2. Germany, the UK, and Japan contributed over 10 billion annually, making them significant donors as well.
3. Netherlands and Sweden provided aid just under 10 billion each year, demonstrating their commitment to supporting developing nations.
4. Aid amounts from most countries fluctuated during this period, except for Germany which maintained a stable aid level.
5. On a yearly basis, some countries such as the US, UK, and Japan saw their highest donations in 2018, while others had different peak years.

This chart provides a valuable comparison of aid provided by different countries and highlights the need for continued support and stability in aid efforts to benefit developing nations.