In 2005, the governmental "Sociaal en Cultureel Planbureau" in its annual report, noted recurring integration problems for ethnic minorities. While during the economic boom of the 1990s their unemployment and dependence on welfare had strongly decreased, the economic downturn between 2001 and 2004 disproportionally affected immigrant groups. This would be explained by their functioning as a labour reserve, by their lower educational levels and by lower language skills. The report also noted that per capita social interactions between native Dutch and immigrant populations tended to decline over time, partly explainable by the size growth of immigrant groups. Integration levels strongly varied between groups. Surinamese and Antilleans were well economically integrated, but the latter less so culturally. Cultural integration was limited for Turks, but better for Moroccans. Of the asylum seekers, Somalis were among the least integrated into Dutch society, while Iranians were the best integrated with the highest education levels and modern lifestyles. Though the educational levels of the second generation were a significant improvement over those of the first generation, they still lagged behind the native Dutch who themselves on average had been attending ever higher school types. While half of all native Dutch pupils in 2005 proceeded to higher secondary education (HAVO and VWO), for Turks and Moroccans the share was a fifth and for Somali pupils even lower.