An increasing trend in prevalent morbid obesity from 1.8 to 6.1 per thousand participants was found (increase > 200 % ). Morbid obesity prevalence was higher in women. After adjusting for age, a monotonically increasing prevalence of morbid obesity was apparent for both men and women: the relative increase was 4 % per year in women and 12 % per year in men. These trends highlight the importance of preventive actions.