WTP estimates (in AUD) for Australian threatened bird conservation and aggregation of these estimates.

+There are about 11 million adult Australians (rounded; [55]).
1)This assumes that all of those people who did not respond to the survey when invited by the survey company (89%) have a zero WTP for threated bird conservation in Australia.
2)This assumes that all of the 44% who did not complete the survey have a zero WTP and with the other 56% having a WTP corresponding to the sample.

澳大利亚成年人口约1100万（已四舍五入；数据来源[55]）。
1) 本假设设定：所有在调研公司邀请后未参与调查的人群（占比89%），对澳大利亚受胁鸟类保护的支付意愿（Willingness To Pay, WTP）为0。
2) 本假设设定：所有未完成调查的44%受访者，其支付意愿为0；剩余56%受访者的支付意愿与本次调研样本的结果一致。