In industry, innovation and infrastructure, Oman is still faced with "significant challenges", as per United Nations Sustainable Development Goals index, as of 2019. Oman has scored high on the rates of internet use, mobile broadband subscriptions, logistics performance and on the average of top 3 university rankings. Meanwhile, Oman scored low on the rate of scientific and technical publications and on research & development spending. Oman's manufacturing value added to GDP rate in 2016 was 8.4 percent, which is lower than the average in the Arab world (9.8 percent) and world average (15.6 percent). In terms of research & development expenditures to GDP, Oman's share was on average 0.20 percent between 2011 and 2015, while the world's average during the same period was 2.11 percent. The majority of firms in Oman operate in the oil and gas, construction and trade sectors.