The Chinese Indonesian population of Java accounts for nearly half of the group's national population. They are generally more urbanized than Indonesia's indigenous population but significant rural and agricultural communities still exist throughout the country. Declining fertility rates have resulted in an upward shift in the population pyramid, as the median age increases. Emigration has contributed to a shrinking population and communities have emerged in more industrialized nations in the second half of the 20th century. Some have participated in repatriation programs to the People's Republic of China, while others emigrated to neighbouring Singapore and Western countries to escape anti-Chinese sentiment. Among the overseas residents, their identities are noticeably more Indonesian than Chinese.