@theredeemer worldwide the situation for mormon active membership is even worse
In the "Vital Statistics" article of the Encyclopedia of Mormonism, Dr. Tim Heaton cites internal church data:
"Attendance at sacrament meeting varies substantially. Canada, the South Pacific, and the United States average between 40 percent and 50 percent. Europe and Africa average about 35 percent. Asia and Latin America have weekly attendance rates of about 25 percent."
For clarity, Dr. Heaton cites data as representing the average attendance at sacrament meeting as a percentage of membership. These figures do not appear to include "lost address file members," as sacrament meeting attendance rates are calculated based on total congregational membership, whereas lost address file members are not included in congregational rolls. When "lost address file" members are included in the denominator of total membership, weekly attendance rates as a percentage of total membership would be further diluted by our conservative estimate of the lost address file comprising 10% of total North American membership and 30% of membership in the developing world.
Read this article written by mormons
http://www.cumorah.com/index.php?target=church_growth_articles&story_id=13