Bankinter: Investors’ confidence in economic activity improves, although it still remains in negative territory. The Sentix Index rises more than expected in April to -8.7 from -11.1 previously and -10.1 estimated. The improvement is driven by the Current Situation component (-4.3 from -9.3). The Expectations Component remains stable at -13. This is the sixth consecutive improvement in the Current Situation Component. On a monthly basis, Sentix surveys more than 1,300…