Different sources give very different percentages. in 2006, fewer than 7% attend church or mosque regularly (at least once a month). Similar studies were done in 1966, 1979, and 1996, showing a steady decline of religious affiliation. That this trend is likely to continue is illustrated by the fact that in the age group under 35, 69% are non-affiliated. However, those who "are" religious tend to be more profoundly religious than in the past. Religious belief is also regarded as a very personal affair, as is illustrated by the fact that 60% of self-described believers are not affiliated with any organized religion. There is stronger stress on the positive sides of belief, with Hell and the concept of damnation being pushed into the background. 53% of the Dutch population believe in a form of life after death, of which a third believe in some kind of heaven (with or without a god), but with only 4% believing in Hell. Of the entire population, 10% believe in a reunion of family and loved ones, and 10% in the survival of the spirit, soul or consciousness. Of the people who answer positively to whether they believe there is life after death, 15% think of the afterlife as "living on in the memory of others". Furthermore, 6% believe in reincarnation generally, and 5% in reincarnation in human form exclusively. One-quarter of non-believers sometimes pray, but more in a sense of meditative self-reflection. Atheism, agnosticism, and Christian atheism are also on the rise, and are becoming broadly accepted. The expected rise of spirituality (ietsism) has come to a halt according to research in 2015. In 2006 40% of respondents considered themselves spiritual, while by 2015 this had dropped to 31%. The number who believed in the existence of a higher power (theists and certain ietsists) fell from 36% to 28% over the same period.