Fujita and Diener (2005) studied the stability of one's level of subjective well-being over time and found that for most people, there is a relatively small range in which their level of satisfaction varies. They asked a panel of 3,608 German residents to rate their current and overall satisfaction with life on a scale of 0-10, once a year for seventeen years. Only 25% of participants exhibited shifts in their level of life satisfaction over the course of the study, with just 9% of participants having experienced significant changes. They also found that those with a higher mean level of life satisfaction had more stable levels of life satisfaction than those with lower levels of satisfaction.