Global trends for PPPs-relating to both the total amount of investment and the number of projects (Figure 1)-come from the Private Participation in Infrastructure (PPI) Project Database jointly produced by the Infrastructure Policy Unit of the World Bank's Sustainable Development Network and the Public-Private Infrastructure Advisory Facility (PPIAF).6 The figures present aggregate values from both sectoral and regional data. From 1991 to 2012, the overall trend for investment in PPP projects was increasing, despite a temporary downturn in 1997-2002. There was a 5.8% increase in the total nominal amount of investment commitments in 2012 compared with that in 2011.7 The number of PPP projects, on the other hand, has oscillated between 200 and 400 projects per year since 1993. In 2012, there was a 13% decline in the number of PPP projects worldwide. Overall, this means that the average size of investment commitments increased in 2012. Brazil and India constituted approximately 55% of all PPP commitments across the developing countries in 2012.8