The charts show the percentage of volunteers by organizations in 2008-2014. Summarise the information by selecting and reporting the main features, and make comparisons where relevant.

The provided pie charts delineate the distribution of volunteer percentages across five distinct organizational categories for the years 2008 and 2014. In summary, the data reveals a significant shift in volunteer engagement over the six-year period, with a notable increase in environmental and healthcare sectors, while participation in arts, education, and sports witnessed a decline. […]