I am looking for evidence / studies proving that 

1) B2B-marketing spending in Europe has been rising during the last
few years (and is still going to rise) and

2) that at the same time the success of the marketing measures is lessening 

If evidence cannot be found, also quotations of decision makers would
be very helpful. (Quotations saying that B2B marketing expenditure is
rising, but the success is diminishing).