Percent of "yes"-replies to 22b: "In the last five years, have you given money to an environmental group (including NGOs and lobby groups)?".

In Environment III (2010) - question 22b.
In Environment II (2000) - question 21b.
In Environment I (1993) - question 21b.

A higher score means that more people gave money to environmental groups in the 5 years prior to the survey. A lower score means that fewer people gave money to environmental groups in the 5 years prior to the survey.