Infra spending slipped from 7% of GDP during 2008-2012 to 5.8% between 2013 and 2017; could fall further if private investments aren't spurred, says rating agency's report
Karnataka, Gujarat, Maharashtra get most investment proposals
Investment growth may have bottomed out in 2016 due to demonetisation, said the report
Sustained GDP growth of eight to nine per cent will be possible only if India's investment rate, which has dropped below 30 per cent, climbs back above 35 per cent