The main economic source of the municipality is centered in the Tertiary sector of the economy, with its diversified segments of commerce and service rendering. Next, the secondary sector stands out, with the industrial complexes. In 2012, the percentage contribution of each sector to the municipal economy was 0.07%, 15.8% and 68.8% of the primary, secondary and tertiary sectors, respectively. The wealth of the capital is largely due to activities coming from all over the metropolitan region, whose economy is the third strongest in the North and Northeast regions and whose population is almost four million. In 2012, the city had 69,605 units and 64,674 companies and active commercial establishments, in addition to 873,746 employees and 786,521 salaried employees. Wages, together with other types of remuneration, amounted to 17,103,562 reais and the average income of the municipality was 2.7 minimum wages.
Question: Which sector of the economy contributes the least?
Answer: primary