In particular, information systems across the SP and the SS institutes remain incompatible and a national patient register or census (a minimum requirement to enable interoperability and closer working) does not exist. Health care in Mexico is less well-resourced than in other OECD countries. Currently, Mexico spends 6.2% (2013) of GDP on health, somewhat less than the OECD average of 8.9%, equating to USD PPP 1 048 per capita per year (OECD average USD PPP 3 453 in 2013).