An index designed to predict the future health of the economy slowly crept upward for the third straight month, a sign that the pace of growth has been weakening since the start of 2015.

The New York-based Conference Board says its index of leading indicators rose 0.2 percent in March, after gains of 0.1 percent in February and 0.2 percent in January.

Building permits were the weakest part of the index, while slowdowns in average working hours and new factory orders have also been in a drag over the past six months.

Conference Board economists say that the modest gains may be signaling a continued decline in growth over the coming months.