To continue building the future of our operation, we invested $17.4 billion pesos during the year, of which 42% was to improve and modernize the current store base; 36% invested in 125 new units that contributed 2.2 percentage points to the growth of total sales for the Company; and the remaining 22% was invested in eCommerce, Technology, Logistics, and Perishables.
Mexico closed the year with 2,356 units by opening 78 new stores. Bodega Aurrera was further positioned as the largest self-service format in the country. We opened Bodega Aurrera number 500, thereby totaling 1,820 stores under this banner. In addition, we concentrated our efforts on reinforcing the omnichannel shopping experience with new store prototypes with areas devoted to the pickup of orders made online, as well as the availability of free wifi service.
In Central America, more stores were opened in 2017 than in the last three years, adding 47 new units to the business.
This achievement was made possible through the positive performance of our expansion program, and it represented a major push towards solid sales growth in the region. We continued assigning resources to the improvement of the operations of stores with over a year in existence.
We worked together with commercial partners to develop retail-ready packaging, offering our field associates the ability to maintain enhanced product supplies through a presentation that serves as a means for merchandise transportation, a storage tool, and shelf display. These efforts translated into a 48 basis point-increase in On-Shelf availability of our items. Likewise, our UPLH indicator (units sold per labor hour) surpassed figures recorded for last year, a reflection of the proper implementation of productivity initiatives.