5.New Zealand: Around 40 percent of the country's population engages in tertiary education and becomes the fifth highest rate in the world. However, the nation had a rapid population growth of 11.88 percent between the year 2000 and 2009. This percent is considered as the eighth largest increase in the OECD. The high output from the secondary schools is also a reason for the high rate of tertiary graduates in the country. According to the report more than 90 percent of the population graduates from secondary school in the country.